The glue will set in a very frew seconds and ready for use in under 30
seconds

The setting speed depends on the grade of cement you have. "wet-r-dry" is the
fastest, setting almost instantly. The heavy duty takes a few minutes before it
is really set but it has 15-20 seconds of "open" time. You need that when you
are joining big pipe, hence "heavy duty". I still wait a while before I slam
the pressure to any of them, at least a half hour on the HD stuff. It may be
overkill but I hate doing things twice.