I let some of mine cure for about an hour before restarting my new LifeReef sump last Sunday night with all new drains and returns plus a modified return manifold. I didn't see any problems. I would however normally let it cure overnight if I could. The project went awry when the old return manifold and the new drain didn't play nice so I built a simplified version of the entire system. I'd say about half of my 120's plumbing had been glued for an hour before I flipped the switches...
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