For the sake of comparison, the "best" time is to be consistent for when you weigh: if you weigh right before a meal, do that each time; if you weight right after they take a dump, do that each time. And like already mentioned above, don't obsess too much about it because some of the weight IS either the meal being digested, &/or the former meal about to be "waste".
If you have a snake that's hard to feed, think twice about weighing them at all though, because you're bound to be causing some stress that won't tell you much anyway. Sometimes "less is more".
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