it can stay out for several hours, however after that it will begin to slowly suffocate as it can only breath correctly under the water.
Fh
However long they feel like it
It depends on how long he's not been eating. When hermit crabs molt, they won't eat or be very active. They will climb into a hiding place and stay there for a couple days.
maybe he is tired and wants to sleep.
In oxygenated water hermit crabs can survive for a short time. Straws can stay under the longest as their modified gills most closely resemble marine hermit crab gills. However, the time varies between the species. Generally a hermit crab will only be under for a minute or two. As long as your pool has an easy way for crabs to get out they are good at regulating when they have been under too long. A hermit crab will not drown if he has a way to climb out.
Hermit crabs don't have a regular size because they grow, they don't stay the same size.
Hermit crabs should stay in a tub of lukewarm water for around 2-3 minutes. You shouldn't bathe them any longer than 3 or 4 minutes. Depending on the type of hermit crab, there is a possibility that the hermit crab could drown, so watching the hermit crab moving is a good thing. Bathe your hermit crab once a week. If your hermit crab is not used to taking baths, start giving him/her baths once a month and when your crabs are used this give him/her baths once a week. Clean your crab for at least 15 minutes or wait until your crab climbs out of his bathtub.
Hermit crabs love a large area with lots of space to play in and plenty to climb on an old aquariam tank is perfect for hermit crab/s
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.
well as long it isn't that deep or else they will drown so keep an eye on them
im pretty sure that not all crabs eat hermit crab food. unless that u mean that do all hermit crabs eat hermit crab food? then the answer to that is yes. all hermit crabs eat hermit crab food.
Hermit crabs are nocturnal, so it sounds like your hermit must have gone to sleep. Mine has slept for a week, once! If you get home and you find your hermit crab out of it's shell and looking see-through, then it has molted. Hermits usually molt on their 'birthday' but stay in their shells a while prior to molting.
It will either stay out of it's shell or have a shell fight with another crab to take its shell. I do not recommend letting your crab have no shell for very long though, it makes them very vulnerable and stressed out making them a good target for other crabs to harm.