I've been doing this the past two days, and here's some of what I've accomplished:
I think it's working, though I'm finding switching tasks every 30 minutes a little tiring, so I'm starting to cheat a little and spend maybe an hour on one thing, and an hour and a half on another.
I've just got to find a groove that works. Since I started my new "irl" job last month I've been sick on and off all that time, so I've been obeying my pounding sinuses and sleeping a lot, rather than whipping them into submission. So I have no rhythm, and it's making drawing a chore rather than a pleasure. This cannot be borne!