I've recently started working from home and I have been putting in about 35-40 hours a week, spread out over 7 days. I work as early as 6:00am, after my morning jog and sometimes as late as after 9:00 (my bed time). Of course, I take occasional breaks during the day to run here or there, or cook dinner, etc...
DH works from 7:00-5:00, 5 days a week, plus he usually puts in some time at night at home.