"Bergensbanen"

NRK. A 7 hour long travel (minute by minute) 
from Bergen to Oslo by train (Norway)

Bergensbanen is 100 years in 2009, and the documentary was a wild idea from NRK staff that came through, and was, surprisingly, a big success.
 Millions of Norwegians have watched "Bergensbanen" on NRK2. The longest documentary ever? At least the longest NRK has made, almost 7 1/2 hours, showing every minute of the scenic train ride between Bergen on the Norwegian west coast, crossing the mountains to the capital of Oslo. LINK NRK