According to the instructions, it takes one week to cure, so I would wait at least that long. Even then, I wouldn't put my snake back in until there was no smell at all. Sorry, I've never used it so don't know how long that will take.
Thanks. I got a 7x10 pond liner that I'm going to cut to size and affix up to the glass edge instead. This way I know it'll be completely contained without having to get a bunch of glue on the panels.