I confess, I know the "right" thing to do is to fix a slow leak immediately.

But given the commuting time pressure (of getting to work on time, or getting home before supper is cold), I thought I might see -- at least a bit more tolerance. After all, commutes are some of my shorter rides (10 miles and 45 minutes, flat both ways). While YMMV, flatting on my commute is not a life-threatening occurrence, merely annoying.

Speaking for myself, I've changed out a wheel or even a bike when that's feasible. As I've noted elsewhere, though, sometimes the other bike is waiting on maintenance, or there's not a spare wheel with the right dyno hub. So I've occasionally just done the "pump and go" bit. As a matter of fact, I don't think I've ever pumped a slow leak and had to stop to fix it right on the commute, although a couple of times I've fixed it before the ride home.

For the second part of the question, I've always fixed the flat right within 2-3 days of the original occurrence. (Note I'm not talking about the 10-15 psi drop overnight -- some tubes just seem to leak more than others.)