Let me put it this way. You may work a full time job. It may be that something happens in your life that makes your job more difficult, because you are preoccupied. Your work may suffer to some extent, but you can still approximately match what's expected of you, because there is a partition between your job and your home life. You may nevertheless feel your full time job seems to dominate your existence, saps your energy, and leaves your weekend respites feeling all too short. This is not an experience I share, because MSPA is not a full time job. If you have such a job, then I would have to RADICALLY REDUCE my workload to match your level of day to day preoccupation.
The actual quantities involved have always been nebulous and I never made a point of keeping track, but 12 hours per day seems like a pretty reasonable average, since that is just shy of all waking hours. Time spent writing, drawing, animating, or just spacing out at my monitor while contemplating all the moving parts. This is what I did every day, including weekends and holidays, for two years, and to some extent another year prior to that with Problem Sleuth. Only a few weekends were missed due to conventions, and there was a single week off immediately following the infamous "robo smooch", and that's it. (Most of that week was spent wondering why the hell I wasn't updating…) There are other gaps in the archive, spanning days or a week, when I was animating. Those spans involved the usual work schedule, while simply omitting sleep!
Not only is this an unreasonable workload to expect of anyone, it's practically impossible to pull it off. Maybe you can expect some committed guy out there to really buckle down and duplicate that effort for a month or two. But years? Too much can crop up in the white noise of normal life to destabilize it. Momentum is absolutely crucial for maintaining that kind of pace. I find that if I only do an hour of work in a day, I get ten minutes of work done. If I do 12 hours of work, I seem to get 24 hours of work done. This is especially true of animation. Such projects notoriously take a very long time. I feel like because of the crazy head of steam I've built up from years of nonstop effort, I can knock out in days something that might take another animator a week. Or in a week what might take a month. Without that momentum, it's not possible. Starting up Flash cold is excruciating. Getting your head back into the stride of a story wastes energy you wouldn't use if you never broke stride. Without the momentum, the pace reverts to ordinary. Getting distracted by life destroys the momentum.
I've been pretty zealous about deflecting the distractions, even when I move, as I often do.
A notable example was last year when I came back from the Emerald City con in Seattle, and found my apartment flooded. The con was already enough of a time sink, so I didn't have much of an appetite for going into personal crisis mode. I just kind of shrugged, picked my computer off the lone, miraculously dry part of the floor, dropped it in a temporary residence, and kept drawing. I think the flood mess occupied about a day of my attention, whereas something like that could easily take up weeks of your time and energy if you're living that "normal life". You know how it is, you come home and find water up to your ankles and go aw fuck, what's ruined, what needs replacing, gotta call whoever and deal with the fuckin landlord about stuff and auuuugh. I just didn't bother with any of that, because it just didn't seem to matter, and I preferred to keep working and not give a crap about all my soggy bullshit. And in retrospect, I guess it really didn't matter.