An hour or so
3 million days
Depending on how old they are. They molt less when they are older and molt more often when they are younger. If they have enough calcium to molt or not. Generally every 1-2 months.
It will usually be molting for a month or two. It's important that you try to leave your crab alone when it's molting.
It can grow to be about two inches long.
not long there gills will dry out and they will die
Yes. When a hermit crab is molting, it reserves energy by not moving. The old skin will be shed and look like a ghost crab. Make sure that your hermit crab has plenty of water in it's dish or sponge as humidity is a great help to him or her during this process.
No, Hermit Crabs and Fiddler crabs require two different environments. The Hermit Crab would drown in the water a Fiddler Crab needs. You can always ask your local pet store if there is any way possible though. Some hermit crabs live on land others live in water even land hermit need two enter salt water , fiddler crabs are brackish or fresh hermit crabs can't breathe in those environments
Its probably just adapting to its environment. You can check if its dead by gently picking up its shell. A dead crab will often fall out of its shell. If its alive let it be. If it buries its self, don't dig it up. Chances are its molting. Molting can take a long time for some crabs and if there disturbed during this process, it may lead to death.
Well if a Hermit crab losing a pincher, claw or even an eye they regrow it back the next time they molt. They have the power to grow back any missing limb or eye during the molting process.
As long as you're sure your crab is dead and not molting, yes, dig it up immediately. You can boil the shell it lived in and put it back in your tank for other crabs to use.
Your hermit crab shouldn't go long without food or water. The longest they should go is a whole day,
two dollar