During the week, my main writing times are on my lunch break at work and after my son goes to bed. (On weekends, I can't even count on a lunch break, so I have to scrounge writing time when I can. Sometimes I write in the car while my husband drives.) It's not much time when you consider I may also have to use this time to blog, answer e-mails, or take care of other personal chores. Sometimes I have to prioritize other things, like listening to my son when he's upset about something. Sometimes I'm so drained it's all I can do to eke out a couple hundred words. And sometimes I let myself be distracted by Facebook or something else I find online. The important thing is not to let a temporary issue become a permanent one. Even if one writing session isn't very productive, it's important to keep going.
What interrupts your writing time, and how do you cope with it?