There are plethora of buses in Copenhagen. There are A, S and N busses in Copenhagen, A being more frequent, but making more stops, and therefore also a bit slower. During most of the day, A buses depart every 10 minutes or so, but during the rush hour, the departures are more often, every three to seven minutes, depending on the bus line, whereas S buses depart every 20 minutes, and five to ten minutes in the rush hour. N buses are nigh buses and they operate from 1am to 5am.