The majority of the time I spend working on my projects is management and organization related. The larger the team, the more time is needed to be spent on that.
When I do get around to working on my stuff it is usually done in long blocks of time (between 4-12 hours in a row). I spent pretty much all of last may working on Blitz2; every day, 7-12 hours a day. I wouldn't advise anyone to work on something like that. Since after a while you get burnt out and, in my case go partially insane.