Hi I have snails that can survive out of water for more than 7 days! Here is a photo from February 28 and one from today March 8 after I spilled water on it and it returned back to my tank.
I don't know what kind of snail that is. But I know some can live both in or out of the water. And even snails that require being in the water can close their operculum so well that the can survive for a long time.
Nerite snails are one of the super common ones that live in and out lol I freaked out the first time I saw one trucking around on the stand. Tossed him/her into a securely lidded tank and it still comes out of the water line all the time.