Enclosure question

Currently my BP is in a 20g long (30x12x12) which seems like plenty of room for him now, hes roughly 24 inches.. but my question is, at what size do you all start thinking of going to a larger encloser?

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I believe when he can no longer stretch out fully. So when he gets longer than 30 inches. I am sure there are people on here with differing opinions on tank/tub size.

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I personally moved my juvenile BP when he hit around 500 grams. I feel that weight is more relevant than length.
For example, my adult King is around 52" but takes up a lot less room than my shorter BPs and Borneo STP because he's much more slender.