Every 10 days is a good estimation for the first few months.... After that: Just as Bogertophis mentioned you are in a realm of variability.
For reference: I have a few males that are 9-10 months old and they haven't taken food in over 2 months and their body condition remains ideal. I wish they would eat more to grow larger, but, as long as they are healthy-then there is no need for concern.
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