For many people in Britain these are 8.30 - 9.00 a.m. to 5.00-5.30 p.m. Consequently people often talk about a nine -to-five job(=regular working hours).Some people have flexi-time(=they can start an hour or so earlier or finish later); and some have to do shiftwork(= working at different times,e.g. days one week and nights the next week).Some people also work overtime (= work extra hours).Some people are paid to do/work overtime,others are not paid.