I wait as long as my hands have a positive expectation. that is, if I'm playing well and I'm only stopping because it's time to go to dinner, or to party, or to play some ultimate, then yes I always wait.

if I start to tilt, or I'm playing like crap, or my image sucks and I can't catch cards to adjust, then why play the additional hands with additional -EV on top of the sunk cost of the blinds.