Assuming preshave prep as maximally softened the hair cuticles, for how long does the effect last? In other words, when I get out of the shower, if it takes say five to ten minutes to mix lather, apply, and start shaving, have I lost the benefit of the prep during that lag time? And say another ten minutes into the shave, should I repeat the use of a hot towel applied to the beard? Once the cuticle has been "damaged," or opened, does it stay that way or does it close up again and, if it does, how long does it take to do so? Hope this is clear.