7600 km. Thrice now I have gone to the garage with the right tools, figuring I would adjust the chain. All three times I checked the slack and it was fine. I've never loosened the rear axle bolt on this bike, and honestly my chain cleaning / lubing efforts are on the lazy side.
Need new tires next season so I guess I might finally have to take something apart.
This is what I wanted from this bike. Just something to ride when I feel like it, that wouldn't demand much of me otherwise. If you really like to tinker, I could see how this would not be very satisfying.