Hi,
The idea is snake eggs need far less oxygen in the earlier stages - but, being an impatient ant worrysome father I have always burped ( i.e. exchanged air ) at least once a week in the beginning and almost daily when I think they are due to pip. All these things depend on the size of the tub and the percentage of it that is air. In a small tub with a deep substrate I would burp more than in something like VPI uses which has about 3 cubic feet of available air all the time. Sorry it isn't a simple answer but there are too many factors to give flat advice.
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