hello i would like asking you about how much clearance do you use ...

on lathe i use 2.5 mm

on mill i use 5mm; i use more because i am not yet comfortable with the machine ... i worked more on lathes


i am asking this like is there a minimal value, so the motors to speed up and reach optimal value before tool enters the material ?
is my 2.5 too low ?
should i consider a reaction time, for example, of 5 complete revolutions ? or 0.3 seconds ? kindly !