Silicone Cures, not hardens, but I think it usually takes 24 hours for it to cure...
If you're going to make another, then don't worry about sealing it like that. If you ever had to take it apart, you'd be screwed. What you should do is dremel out a groove a little ways in from the edge, that way you can put a Silicone o-ring and seal it that way.
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