I used a month of my life last summer only squatting for 31 days straight. I was in a zoombie state most of the time, and was really tired, so i basically just got up, squatted, ate, had a bath, went to sleep, or just lying on the bed, and then repeat it all over. I started to feel better by the fourth week, ie. i started to feel that I became normal again, and not so staggering tired.
I had every other day heavy and light, and varied the reps.
The entire layout of the program I followed is here:
Spredsheet made with open office. (Just download open office and install it if you cannot open it right away).
Pablo aka tlast2O12dude which is a lighter lifter did even more days than me, do not remember exactly how many days, but I think it was squatting about 6 weeks in a stretch, and he was supposed to follow the template with the percentages, but he almost every day did "bonus" sets. That would nearly have killed me.
None of us used assistance, but of course with such medicines even larger volume of training is possible, and I believe some lifters even can have a very high volume schedule when they are natural.
There is a huge difference in dedicating the entire life to lifting as opposed to having responsibilities in addition to the lifting.
There's a lot of info on the web about this, but the dangers for real injuries are always there when embarking on something like this. Many lifters do not reccommend the everyday schedule, Mike Tuscherer being one of them.