How long would that be? The part is in the full sun since 9 AM this morning. I just went up there and touched it, and it is still a bit soft. I figure 8 hours at 90 degrees F in the full sun should be adequate to apply water pressure.
But, what is the correct answer? I may just leave the pressure off for 24 hours and be extra sure. It's to the solar heater, and I like the water warmer than it is without the heater.