For clients who aren't setup to pay automatically through 2CheckOut we usually suspend wtihin a 5-10 day period. If we don't hear back we terminate after 14 days.

Actually just went through and suspended two accounts tonight.

Now that I think of it, I stilll have some dude's site on my server and I haven't had a cent in months...
Until it starts to cost me money, I usually dont bother...that combined with the fact that I'm too lazy to get his domain off my server...I NEED COFFEE!!! NOW!!

We'll usually let it slide for a few days, after suspending the account, however this depends entirely on the situation. We're usually very strict on repeated offences and will eventually terminate the account.