I usually work on Saturdays. Not quite as dedicated or busy as on Mon-Fri, but by default it's a workday. Sundays are generally off.
What about you? For the sake of this poll, any time from midnight to midnight counts. So if you work the graveyard shift Friday-Saturday, then you work Saturday. If you work the graveyard shift Saturday-Sunday, then you work both days.
[e] Oops... no poll attached. Oh well, whatever...
[e] Poll added. Thanks blue_neon for the tip.