Yes, I would think slower, longer would be easier on the heart etc.... but you sleep anyway, so you are not wasting any time really.Except I probably won't be able to get up and post at 2:30 in the morning anymore. It will be a couple of months before I move up that way, so we'll see. Right now I'm on a catheter and I'm not sure if a "fistula" is a requirement. I have a fistula too, but I'm using this cathater until it falls out!