We have had guys here in the past who did strop progressions. Multiple laps on linen, latigo, horsehide, this brand, that brand. I used to do 50 linen 50 leather, but now I might do 30/30 - 40/40. Never more than 50 in my long life, and one linen/leather strop at a time, though not always the same one. No rules when it comes to our shaving rituals though, we can all experiment with what works and suit ourselves.