We have no regulations at all... I've worked 28 hour shifts. We usually end up with some downtime (I slept about three hours on the last one I worked), but no official breaks. However, we don't have portable radios, so we can ask dispatch to let us both go into a restaurant to pick up food, and they will sometimes say yes. I've worked 16 (+2 overtime) without enough time to stop for food (even in the hospital caf).