Minimum tub or enclosure for adult MBK

What would be a minimum size tub/enclosure/tank for an adult female MBK?

When I kept MBK, I liked them in a 40 gal. 'breeder' tank...that's about 3' x 18"....but you can do larger too. They're great to watch & fairly active.

My almost 2-year-old is currently using half of a T8... 48x24, so is essentially is a 24x24. I was going to give her her own TO, but now contemplating is she'd be comfortable in something smaller, and give the T8 to another snake.

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