Coastals average 6-7 ft. 10' is on the extreme side that is only possible with some locales that are not readily available in the US and are hard to get even in Germany (quite easy to get in australia though). For these, a 3x2x2 is perfect. My Jag is growing out and is right at 6', and fattening up. She's in a 3x2x2 and roams it perfectly with adaquit perching provided. IJ can even be housed in 2x2x2 in SOME cases (males), some females will still need a 3x2x2 though since IJ even though most stay around 5' some can get quite beefy and even reach 8'. All of this is based on personal experience, the book "The Complete Carpet Python by Nick Mutton" and previous conversations I've had with Nick on this matter. Anthony over at ACReptiles pushes the same religion. He houses his in 3x2x1.5 (tall).
Cheers
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