I checked the Massive Development Chart at www.digitaltruth.com and got no help. Ilford has no times for this devloper,either. If you use Acufine a lot, try comparing development times listed with other films as a starting point. I have used this film quite a bit lately, and have used X-tol with good results. Scroll down the question list a bit for some good suggestions. Ilford recommends Microphen. You may just become the resident expert on Acufine!(posted 9083 days ago)