How long do snails sleep for?

Snails can sleep for up to two years! Don't worry if you've lost your snail. Just fish around in the gravel a bit and you'll probably find him. he could also hide in any decorations that you have. Or, I hate to say it, but if your fish has a really big mouth, they can sometimes suck snails out of the shells and eat them. my sicence teacher had it happen a few times. But don't worry. If you're snailbegins to float on the water, I'm sorry, but he's gone up to that big fish bowl in the sky. Your snail knows when to wake up and eat, though. Just let him chill for awhile, and make sure he has plenty of algae.