Is there a way to speed up printing process inside a darkroom? Let me explain: I don't have a personal darkroom so I need to rent one. Obviously it will cost some money (25 for a 4 hours session) so I'm in the process of finding an efficient way of printing. I'm not interested in artistic works, I'm only interested in printing photos as memories, much the same way a professional colour lab still does with c41 films. Now here's what I thought could be interesting: 1) I make a contact proof of the entire roll, exposing to obey the maxium black - minimum time rule; 2) I choose the darkest, the lightest and medium density frames on the contact sheet; 3) I try printing them, assessing the right printing time for each of these frames, the usual way (covering progressively the print with a strip of black paper...); 4) For example: the lightest print requires 6 secs exposure, the darkest 20 secs and the middle 13 secs; 5) Now I mark with a permanent maker a number on the contact sheet frames as following: medium: 0, darkest: +7 and lighest: -7. Now I have deltas for the extremes of exposures; 6) WITHOUT making other test prints I print all the other frames of the roll eyeballing the single exposures just by confronting them with my three extremes. This way I think I can print an entire roll in 2 hours. Can this procedure work?