"Overtime hours" refers to the extra time that someone works beyond their regular working hours. It usually involves additional pay or benefits as compensation for the extended working time. Full definition
I am now being asked to work overtime hours in the following week - but I don't think I can in good conscience do so (I need the extra time). (law.stackexchange.com)
The analysis also found the number of overtime hours attributable to work rules has remained constant since 2009. (newsday.com)
Ask for a few overtime hours at work and compete with your friends on how much extra you can throw at your credit cards this month. (blog.readyforzero.com)