Bitvisitor payment delays

Bitvisitor seems to be having payment problems again. They've had periods where they hiccuped and delayed payments for a time before and it's happening again now. This time, they've changed the code so you can actually see how late they are. The promise payment every 60uBTC, here's how far behind they are on my account.

Balance: 189.352 uBTC - Payment is sent every 60 uBTC!

This translates out to about a week behind promises. Since the amount is so small and they've recovered from these hiccups before, I'm still grinding out these little ad views anyway for now.  I'm sure a lot of their viewers are. Past a certain point it starts to get to be a problem and it's time to cut them loose. Any ideas on what an appropriate level might be?

Update: And they finally released the balance at 193.35 uBTC on the 20th at 9PM. It's a classic bitvisitor hiccup and exactly the sort of problem that bitcoin transactions regularly have.