From "microseconds" to "milliseconds"

delay() is milliseconds

Marlin/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/Cartesio/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/Felix/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/Felix/DUAL/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/Hephestos/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/Hephestos_2/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/K8200/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/K8400/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/K8400/Dual-head/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/RigidBot/Configuration.h

 //
 #define NUM_SERVOS 0 // DGlass3D - Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/SCARA/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/TAZ4/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/WITBOX/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/adafruit/ST7565/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/delta/generic/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/delta/kossel_mini/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/delta/kossel_pro/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/delta/kossel_xl/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/makibox/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300

Marlin/example_configurations/tvrrug/Round2/Configuration.h

 //
 //#define NUM_SERVOS 3 // Servo index starts with 0 for M280 command
 
-// Delay (in microseconds) before the next move will start, to give the servo time to reach its target angle.
+// Delay (in milliseconds) before the next move will start, to give the servo time to reach its target angle.
 // 300ms is a good value but you can try less delay.
 // If the servo can't reach the requested position, increase it.
 #define SERVO_DELAY 300