24 hrs to 72 hrs
24 hrs to 72 hrs is reasonable unless you see that the Azer you're dealing with is signed onto the Forum or
you've seen their posts attesting to the fact that they've been on the Forum since your PM contact with them.
If that's the case, 24 hrs becomes the default timeframe.......keep in mind that people have lives, responsibilities
(work & personal), and unexpected problems could conceivably have arisen that interfere with answering you.
People can be out of town, experiencing Internet or computer problems, preoccupied with more pressing needs, etc., and
since you don't know the other party's situation, I'd allow up to 2-3 days, not 24 hrs unless you've seen them on the Forum.
Matt B.