I have a wild schedule. I get the kids up, get them ready to go to school, and then I have 2.5 hours before I go to the school and work. I work very part-time--only about 2.50 hours a day, but it's pretty much just to get me out of the house and I do contribute a little to the household.
After work, I have a little over an hour until the kids come home. I can read and edit some before I run out the door to get them off the bus.
So, during the week, during the hours before work, I can get a little writing/editing in. When hubby comes home, we'll usually watch a little TV after dinner. If there's nothing good on, he'll turn on his video game and I'll write. If I'm restless, which happens a lot, I'll stay up late after everyone's gone to bed and it's quiet. Nobody needs anything at that time of the day, so I can write/edit nonstop, without distractions or interruptions.
On the weekends, it's scattered times. Pretty much when everybody else has their own thing that they're doing, and they don't need me. I have 2 kids under the age of 10 who have just discovered a video game called Little Big Planet, and when they're busy at playing with that, I'll write.
I'd spend most of my time at night writing if I could, but the kids and life wear me out sometimes.