When I get my hair cut I take my Zero Image pinhole camera to make an exposure of the process. I mostly use Tmax 100 with exposure time around 15 minutes, i.e. as long as it takes. I try to put the camera in a different place each time. This one was very close. It was the last time I had my hair cut but I can't remember when that was, must have been early August or late July. Just finished the roll today and processed in Adonal 1+50 for 12 minutes at 20 deg celsius.