most of the PVC cements i have used have directions on the side. i'm not sure if they're all specific to the product (most sound in the ballpark of what you described), but i usually go for a full 24hr cure before putting the newly glued pieces in to use. they're typically water tight after 1 - 2 hours, but i assume there are still VOCs being released from the glue for a little while at least.
usually by the 24 mark the smell has died down considerably, and that's my cue that they're good to go.