I had my 20-222 built with a 26in tube. It burns a small amount more powder than does the VT and I think I'm going to have it chopped back to 24.
These smaller case capacity cartridges don't really need a whole lot of barrel length and they seem to, not only perform very well with a 24in tube but a 24 balances out the rifle really well too. Nothing wrong with going shorter either and if you are running it suppressed, you very well could like it at 20 even better.
I'm still scratching my head trying to figure out why I wanted a finish length of 26 on my 20-222.