Cardisoma armatum is land crab which could live out of water without problems. But necessary is high level of humidity and shallow pot with water for drinking and washing gills too.
They can reach a carapace size of 20 cm across, although captive individuals rarely reach this size
2 hours
not long there gills will dry out and they will die
three days
A Hermit crab can live up to 100 years of age
yes horse shoe crabs live all over the world as long as there is water
It depends on the type of crab you are referring to. If it is a hermit crab, it will eventually die because hermit crabs need seawater (seawater contains iodine and other minerals that support the growth of the crab.) If it is a normal crab (the ones you eat and cook) it can adjust to the environment or the freshwater you were talking about. If crabs can live in land, so do they live in fresh water.
It depends.
10 years
Hermit crabs live on land, for they only need water to drink, not to live on/in.
Stone crab have a life span of 7 to 8 years.
rainbow
If your talking about the medium-sized Brazilian Rainbow Boa, they can live for up to 20 years. There are other reptiles, though, that are known as "rainbow snake."