Re: How long can a Crab stay out of the water for?
I am guessing that you have either a fiddler crab, or a redclaw crab, since those are by far the most common.
This definately falls into one of those times where you smack yourself and say "Doh! should have done the research!"
Crabs are very, very picky! If you are thinking about getting a crab (you already have one) They need to have access to a space out of the water, or they will find a way out. They can live in the water just fine, but they like to crawl out every once in a while, not really sure why.
They can survive quite a while outside of water though, when I worked at petco, I would frequently find them scurrying along the floor, since obviously corporate did not care if they needed access to land or not, and they climbed out of the tanks. They will also try and catch your fish, not neccesarily kill them, but they will try and catch a fish, then eat a few pieces off of it before the fish gets away, especially at night when the crab is active and most fish are not.
They are definately cool.... but they have specific care just like any other animal, and of course it doesn't say that at the store.