When to upgrade tub

So I know bloods like small enclosures, but my blood seems like he will be out growing the small tub I have him in. at what size should i upgrade him from 22.44" Deep x 7.36" Wide x 4.25" Tall to 22.44" Deep x 14.76" Wide x 4.25" Tall He is currently about 22 inches long. I was thinking of switching him when he hits 30 inches. What do you guys think?

I didn't get a reply to this. What do you guys think? When should I upgrade him?

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I figured I'd try this again because I was planning on upgrading my blood python this weekend.

What size cage or tub did you have in mind?