435mm for mine and I thought I had a big case by modern standards (Phantek P600S).
I'm tempted to sell my 7800XT and buy a 9070XT. Not for any good reason, but new toy, new toy!
I'd probably be better off selling my board, CPU and RAM (5700X, 32GB DDR4-3600) and buying a 9800X3D (if that's possible now) with board and RAM for it. But that would be fuss and bother. Swapping a graphics card is a 5 minute job.
Then I consider the games I actually play (mostly older games and/or indie games) and realise it doesn't matter as my current hardware is more than enough for them.
But new toy!
Guess it depends on actual price and actual performance. And hey, selling my 7800XT now will get me more money than selling it later, so I'm saving money, right?