Congratulations, you have just finished doing five hundred strokes. Doesn’t that feel great? I hope you like your reward, but I’m not sure if you are calmed down enough.
So why don’t you set the metronome to 50 beats per second, and stroke yourself fifty times with one stroke on every beat.
And to make it one hundred strokes, give another fifty strokes, but this time, one stroke every two beats. Up on the first beat, down on the second.