How long do snails live without water?

I think they can live for around a week since I have snail in my desk and he/she is still alive

My -daughter found a snail on our oatio in Florida 6 weeks ago..a brownish shiny thin shelled one..later in the day, she picked it up..there appeared to be nothing inside. She put it in her jacket pocket, when I went to wash the jacket later, I found the sanil and put it on a shelf...6wks later..I thought it would look nice in my Aquatic Turtle tank...10 minutes later it was on the glass, moving all around ..I couldn't believe my eyes...