This all depends, some days It goes up more then 15 times. And others barely none.
In the nights it must be somewhat erect during the whole sleep.
But in a bus, it is always getting up. That fucker! *angry*
Another angry and annoying thing is when it gets up nad it cant fit in the pants... So I have to losen the belt, and then it looks weird, cos then the pants is kept up by the dick lol.