So far the only maintenance we've done on the Rohloff Speedhub has been to take a hose and wash off the dirt. Even after the muddiest race at the Icebreaker event where the mud was so thick it was hard to walk through, all we did was hose off the bike.
Rohloff recommends that the oil be changed annually or every 5000km. So we thought we'd change the oil before the season gets underway just to see how long or difficult it'd be. The Rohloff Oil Kit comes with a syringe, oil filling tube, 25ml of cleaning oil, 25ml of all season oil and a drain screw with a new seal.
The first step is to remove the drain screw and put in 25ml of cleaning oil into the hub. Time - 5 mins. The cleaning oil is used to thin the existing oil and clean out the internal gears. Reinstall the drain screw.
The second step is to either ride the bike for about 1km or spin the bike in the bike stand for approximately 3mins. This is to make sure the cleaning fluid does its job and dilutes the oil so that it'll be easier to drain. Time - 3 - 5 mins
The third step is to turn the wheel so that the drain hole faces down and let gravity do the work for you. Time - 15 mins. We took this time to clean the chain and the cog wheels on the chain tensioner.
The fourth step is to remove the drain screw and using the filling tube and syringe, remove ~50ml of oil/cleaning fluid from the hub. Time - 5 mins
Last step is to fill the hub with 25ml of new Rohloff oil and install new drain screw with the new seal. Time - 5 mins
Total time is under 35 mins. This is for a whole season of riding. We used to spend that much time after every ride. Not to mention lubing and replacing shifter cables, housing, worn cassettes, chains, etc. The Rohloff uses full length cable housing so that the cable stays clean throughout the season and since the chain is not used to shift up and down a cassette, there is less wear and maintenance is minimal.
The Rohloff hub is not going to replace the derailleur system anytime soon but definitely offers a strong alternative that is on par or better performance wise and better in terms of longevity and maintenance. Now if the Rohloff can shave 1/2lb to 1lb off the hub, then it'll really make a case for itself.