General Feelings on a 24" setup?

[Bogertophis]

Out of curiosity...and I know this will be down the line a while...how do you determine when a BP has outgrown its space? Corner to corner length? Behavior?

I think you'll know- it depends partly on the activity level of the species you're keeping. BPs are known for hiding a lot & not being very active, though you can also have exceptions to that & you'd want to take that into account also. Many find BPs prefer "cozier" homes- but again, it's hard to put that into a formula.

There are guidelines issued for minimal space afforded captive snakes given by various state Fish & Game agencies- I seem to recall some require an enclosure where the length of the enclosure plus the width must be equal to or not less than the full length of the occupant- or something along those lines.

But there are so many ways to set up homes for snakes- for example, if they're a type that climbs, that can be a way of increasing their usable space within (much like a multi-story house). Most people don't say their BPs climb, but I've seen a few exceptions- & sometimes you never see such behaviors if you don't first make them possible. When I kept adult BPs, I used enclosures that were 3'-4' long, depending on their size. (My biggest female was a 5'+ w/c rescue, but the c/b adults were all about 4'.)

One obvious way to suspect that a snake of any kind has outgrown their home is when they keep trying to push their way out. Some start rubbing their noses in frustration.

Another consideration is having enough space to provide the temperature gradients needed by the snake. It's hard if not impossible to offer the range of temperatures in an enclosure that's too small. Each area (warmest or coolest) has to be big enough for the snake to fit in it, obviously, & when these areas are too close together, you lose the variation- the temps. run together.

Also, snakes need enough space to have at least 2 hides (cool side & warm side), or better yet 3 (including a humid hide), plus a water dish. All this stuff has to fit, & if it doesn't, the enclosure isn't big enough for the snake either.