For SendPlay mode, the default Delay is -1. If SetKeyDelay is never used by a script, the default Delay for the tradional SendEvent mode is 10. Leave this parameter blank to retain the current Delay. Use -1 for no delay at all and 0 for the smallest possible delay (however, if the Play parameter is present, both 0 and -1 produce no delay). Time in milliseconds, which can be an expression.
SetKeyDelay, Delay, PressDuration, Play Parameters Delay Sets the delay that will occur after each keystroke sent by Send and ControlSend.