Ok Mr. Righteous.
I'm not even going to try and argue this.
I would say 2-3 times a day doesn't hurt.
If you are bruised stop being so dam rough.
Just remember to cool your stuff next time and don't fap so hard.
Otherwise there isn't a big issue, make sure to eat right and if anything hurts stop doing it.
If you're worried about it read up on the subject of what is a good amount. (I know I have)