Time honestly means nothing. You need to be absolutely sure you cannot smell any trace of the silicone (it gives off a pungent- irritating- vinegar smell)- since it will irritate the lungs of a snake. The thicker you apply silicone seal, the longer it takes to dry, as it dries from the outside- the inside (when it's thick) can take a long time to fully dry. If you apply it really thick, it can take days or weeks to fully dry.
Personally, I'd error on the side of caution, & wait a few days beyond when I couldn't smell it, because our sense of smell is very poor compared to our little snakes, & remember, they mostly only have one lung too. Airing out the enclosure in warm or hot sunshine will help, as will running a fan inside.
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