Awesome tub...right size?

[Daigga]

I've been wondering about floor space. The average tub used in racks is about 36x16 = 576 inches of floor space. I read the how to set up a 20L, and if i remember right it said something about most or allot of balls could use this size their entire life. A 20L is 30x12 = 360inches of floor space. I ordered a showcase cage that is 24x16=384inches of floor space. Please correct me if I'm figuring this wrong.

So theoretically my 24x12 cage should last their life time. How do i tell if/when the snake needs a bigger one ?

I'm not sure where you heard a 20 would last their entire life, I had always been told an adult ball python should be kept in a 40 or equivalent tub or pvc enclosure. I had my igger normal male in a 20 when he was about 600g and it was a tight fit, can't imagine keeping a 1500g+ snake in that size tank.