Excluding the hours you spend sleeping, of course.

For me, it would have to be the kitchen/dining room area... that's where I make breakfast for Charlie in the morning, and where we eat it together. Then when Olive wakes up, we all hang out there. Then in the evenings, Bee makes dinner and we both try to get the kids to eat (or not).

Next up would be the downstairs office, where I usually work in the evenings.

What room of your house do you spend the most time in?