When a razor begins to tug I do 20 laps on a CrO pasted strop to refresh the edge. When that doesn't appear to work I use my Nortons 4K/8K followed by the pasted strop. This works for me. I don't own a barber's hone I shave six days a week (Sundays I give my face a break) and have a 5-razor rotation. So I can go for several weeks before having to refresh the edge. One thing to keep in mind is that each razor will be different so there is no set time. But if you like a periodic preventative maintenance approach you can do them all at the sime time.