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As a salaried employee, your wages are not dependent on the number of hours that you work at all, so as long as you do any
work in a day you are entitled to be paid for that day.
However, as a an exempt salaried employee, your employer can require that you work 50 hours a week as a condition of continued employment, if you are correctly classified as an exempt employee.
However, you would be entitled to overtime wages if you are misclassified as exempt, since many employers classify employees as salaried exempt to vaoid paying them overtime when they should be non-exempt employees.
You can read more about the exemptions to overtime for certain employees online here:
If you don't fit into either the Executive, Administrative, or Professional exemption, you should be a non-exempt employee and would be entitled to overtime wages for all hours worked in excess of 8 in a day or 40 in a week.
If that's the case, you should file a wage claim with the Dpeartment of Industrial Relations for unpaid overtime, which you can do using the forms available online here: