So to answer your question as far as I can (and bearing in mind the other two comments that drying times do vary), I hang my negatives for at least 2 and preferably 3 or more hours, after a final rinse with de-ionised water (I'm a cheapskate) and wetting agent (Kodak Photo-Flo in my case). I think I use 2 ml per 500 ml of water, so my current bottle will probably last my lifetime! After hanging, I cut in strips, sleeve and place under a weight usually for 24 hours before scanning. So that's Midlands England, middling humidity, hung in a shower room that has been used that morning (but I don't run the shower before hanging, as some folk do to dampen the dust down). Can't think of anything else worth adding!