I recently printed a Stouffer 21 step tablet (densities of .15 to 3.00)on Azo to determine the paper characteristics of both grades two and three Azo. Using my enlarger (Saunders 4550 XLG with 250 watt light source) with the lens aperture at F5.6 my times were six and one half minutes for grade two and eight and one half minutes on grade three. (Grade three requires approximately 33% more exposure than grade two by my tests).

This paper is approximately 1/25 the speed of conventional silver enlarging paper. (paper speed 6 compared to 150 for Kodak variable contrast). That is why most use a reflector flood lamp to expose Azo. Hope that this gives you some idea.