Going off your comment about Ansel, is there a multiplier that can be used (roughly) of development time vs. shadows first appearing?
If they show in 8s I would say development would be shorter than if it was at 20s. A factor of 5 or 6 would mean about a min for the 8s and about 2min for the 20s.
Oh and it was warm in the darkroom/laundry room but I didn't take the dev temp.