To clarify, she's a physician so it may be different than in other fields.
She sets her clinic hours, the group is always happy to have longer clinic when the nurses and support staff is available (8am-8pm). Currently her schedule is 30 clinical hours a week, she'd like to be working about 40. This scenario would allow for 35 hours per week. Sitting in the stupid traffic is a lot more draining than taking care of people, so she's happy to move. At any rate, compared to the 60-80 we work now, that's awesome!
On a side note, I'd rather us both be working 20 hours a week, but that's for when we're financially independent!