lung function tests. Lung function tests, also called pulmonary function tests, measure the size of a person's lungs, how much air can be breathed in and out, how fast air can be breathed out, and how well the person's lungs deliver oxygen to the blood.
Weekly Limit. The maximum number of hours most employees can be required to work in a week is 48 hours. The weekly maximum can be exceeded only if there is a written agreement between the employee and employer and the employer has received the approval of the Director of Employment Standards.
State Rules. State rules regarding how many hours you can work per day vary considerably from state to state. Some states, like Alabama and California, do not enforce a maximum on the number of hours in a workday. Others, like New Mexico, Oregon and Florida, limit workdays to between 10 and 16 hours per day.