Hack Reactor is ~11 hours a day and has all the social support and camaraderie that comes when you do the same thing w/ other people. I'd be surprised if someone on their own could learn as well in the same time.
11 hours a day is a bit extreme. After a certain point I would be concerned about my retention. Personally, I've never had good results from studying more than a few hours a day, but I understand this may not be the case for others. I usually study a bit, take a break for a couple hours, and study some more.
11 hours a day for 12 weeks can't compare with two hours a day for a year.