28 inches deep is fine, and maybe still more that you need, for an adult female. But if you get that size, it will be large enough for the animal's life.
I have 1 6'x 3' cage and 4 6'x 28" cages.
I have a 9 1/2 female in the larger vision and it is way more room than she needs.
I like visions, easy to clean and heat.
The 4' vision would be fine for a male boa...for life.

Good Luck!

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