As far as pacing the shoot is concerned, I know when I've got it. I don't think there's any reason to take ten takes unless you need them.
Sometimes I don't even pull my shoes off for six weeks at a time, except, you know, just to take a shower. I just take breaks between 24 hours a day, just a break now and then, it don't take me long to rest; maybe 20 to30 minutes sometime, or maybe an hour.
I think it is most important for a teacher to play the pieces and studies that are being played by the student.