I print slides onto Ilfochrome and exposure times of 1 minute plus are not un-common. I used to print onto Kodak Radiance, and exposures were much shorter, but then the saturation didn't match Ilfochromes. I like having long exposure times because the burning/dodgeing doesn't have to be as precise to render great results! I never exceed 3 stops on the lense, and often go with 2 stops.