San Rensho 

I do very little maintenance on my bikes. I ride the 3 speed every day, the road bike 2-5 times per week. I've gone years without repacking bearings. A chain lasts me a year, easily. I've had freewheels last 5+ years

The only regular maintenance I do is the chain. I rarely take the chain off the road bike to clean it, just wipe it with a paper towel about every other time I ride it (takes about 30 seconds) and sparingly put motor oil on it every few rides. I've never had any major mechanical problems.

Bicycles are very simple machines that carry relatively little loads. Once they are initially assembled correctly, there is very little that needs to be done to them.

Oh, and I wash the bike every six months whether it needs it or not.