During this period the standard Mediterranean warship was the quinquereme, meaning "five-oared". The quinquereme was a galley, long, wide at water level, with its deck standing above the sea, and displacing around 100 tonnes (110 short tons; 100 long tons). The galley expert John Coates suggested that they could maintain 7 knots (8 mph; 13 km/h) for extended periods. The modern replica galley "Olympias" has achieved speeds of 8.5 knots (10 mph; 16 km/h) and cruised at for hours on end. Average speeds of 5–6 knots (6–7 mph; 9–11 km/h) were recorded on contemporary voyages of up to a week.