I support the family at the moment, as DH's business has been VERY slow this past year or so. However, I have a sewing room now, so I can go in there when I have a few minutes that I have to myself and do something.
Before I had the sewing room, I would need to have a good few hours "free" so I could set up/break down and get something accomplished - so I would sew only on weekends or when I had a deadline for a gift that was more important than "other work".
sometimes I'm in the sewing room every night, and most of the weekend days. Sometimes I don't go in there for days/weeks at a time. It all depends on what else is going on in the house, and how much of the household chores and running kids around DH is willing to do at the moment.