Im in the process of gluing some PVC together for my return...long story but I put a ball valve in live to be able to throttle back my return pump. Im using regular PVC glue..how long should this dry before turning the pump back on to the return? I have heard the glue drys within minutes. I thought I would make this repair tonight during a water change so the pump that the PVC is going to be connected to is going to be off like 30-45 minutes. Is this long enough to let the glue dry? I dont want to harm any fish or corals.