I'm studying with Bristol full time at home. I average between 2 and 7 hours a day, normally 5 ish. I am however very lazy, and have never ever had the self-discipline to work alone.
Typically with the hefty stuff like Met, Human Perf and stuff without pictures, I average about 3 pages of the folder an hour. I make very comprehensive hand written notes, and only ever work from the folder (not the CD). Typically score 85-90% in the progress tests too!
Hope this helps.
F