Powerman Duathlon is the longer distance in duathlon. The most normal distance is 10 km running, then 60 km biking finishing with 10 km running. However there are also Powerman with slightly other distances[1].
One of the more known duahtlons in the world is Powerman Zofingen, in Switzerland. It is actually 10 km running, 150 km cycling and 30 km running.
Other notable Powerman Duathlons are Powerman Alabama (10-60-10), Powerman Vlaanderen in Belgium (10-60-10) and Powerman Muncie (10-60-10).