Not really on topic but my sister is a psych nurse and they are understaffed. They are constantly required to stay on duty for a double shift which is 16 hours. Then they have 8 hours off before they have to go back to work. There is a limit on how many 16 hour shifts they can work in a week (I don't know what it is). The 12 hour rule may only be a state law so other states will have different limits. Nebraska allows for double shifts.