How long should I keep the pop-up open after rain?

I've never had to close up mine in the rain, but if there has been moisture due to morning dew/humidity, I pop it up for a few hours at home just so everything has a chance to dry out. I also keep a couple of buckets of "Damp Rid" inside at all times - you can get at WallyWorld. This helps keep inside drier and less chance of mold/mildew.