Nashville EMS went to 12 hour shifts and they love them. 2 days (6a-6p) and than 2 nights (6p-6a), then off for 4 days. Better than the 24hr shifts they were doing and trust me these units are BUSY. They have 18 ambulances covering 700,000 people. On paper supposed to be 25 units up,but do to budget....(We all know this story).