Re: all 7 suburi in one go?
I'm not sure what the official word is on practicing these, but I'd do like 100 of #1, 100 of #2, etc. For the walking suburi, I think Saito is just turning when he hits a wall or the limits of the camera angle. I'd do them across the practice space and back again. In suburi practice, you're going for reps. What you learn from the first 100 isn't what you learn from the tenth 100.