Wow, two hours is great. I think that is a great sign.
I did the sauna for a year. I plan on doing it for the rest of my life. I started with 20 minutes, worked my way up to two hours, even though my doctor said that this was too much and would deplete my body too much. So I think long term an hour a day would be good. Something interesting that happened to me, at the regular gym I used to be able to have the temperature very high, as soon as somebody else came in they had to lower it and nobody could stay as long as I could. This all changed after my acupuncturist worked on my thyroid, as soon as he worked on it a couple of times,
I could not handle the sauna for more than 45 to 50 minutes, so the reason that I was able to be in the sauna for so long, even though I was sick, was that my body was really not registering the high temperature. The important part of it is to sweat. I always feel great and "clean" after the sauna.
I think I read in Sherry Rogers book that it would take a year for the average middle-aged person to detox most of the stuff that is already in their body. But as you know we keep adding to the load every day.
I don't remember how much Niacin I took. Somewhere in my files, I have the a list of the supplements that we took and the dosages. As soon as I find the info, I will post it, because they worked.
I am actually jealous because we moved and have to wait until next month when we buy our own sauna because I have been unable to find a sauna in this town. So enjoy.