I just completed the series A exercises. It took me over a half-hour because I was reading the instructions as I went along. I am sure it will take less and less time as I become more familiar.
Breathing is a big part of these exercises. Long, deep yoga-type breaths. I tend to resist this sort of thing, being impatient, but I made myself do it right. Deep breaths just by themselves can reduce pain, which became apparent to me when we got to the last pose, which was done standing.
I think that when I have the sequence memorized I will add my own music to it, too. Could become a really nice part of the day.