Limited. Are you shooting 35mm or MF? I think I took my times straight from digitaltruth, I wanna say 20 minutes at 24c. Gritty stuff that transferred well to lith. Someday I'll get the grade school kid next door to show me how to scan prints and upload.
I'm shooting MF (6x6) on a Hassy. I exposed some at EI 12,800 a while back and developed it for 30 min in XTOL 1:1 and it looked very good, though quite grainy (that roll was on 120 as well).
Today I took some pictures outside Fenway Park after dark and exposed at EI 3200. I'm interested in PMK because there are bright stadium lights in the picture and I think PMK will have a longer highlight tail than XTOL. But I think the negs will be pretty thin if I develop for 800 or 1600 (like most of the recipes I've seen).
I looked. Mine are 22m at 24c. But they weren't tough light conditions. Maybe, chop the roll in half and sacrifice a neg, develop one half and then adjust? Sorry I can't be of more help, only processed five or six rolls this way.