IT Contractors: How do you take lunch?

To you DBAs, Developers, Sys Admins etc. working as contractors: do you eat lunch on the clock that you bill for, or do you take time out of your personal day to eat lunch? Also, do any of you have mandated half or full hour long unpaid lunch breaks in the middle of the day? Please add the state - if you are in the US - or country that you work in. (Assumption: It seems to me that in the US this varies across states - in the southern "right to work" states it seems there is an expectation for an unpaid hour during the day. Blue states I have worked in often forgo accounting for lunch and let it slide under billed time.)