I did a century ride on this on Easter Monday although it was beginning to skip in certain gears. It was fine up until that that but now it's reached that stage, wear seems to have accelerated very rapidly and had it had got to the point of finding the few gears which still worked so it was time to call an end.
They belong to my old Townsend MTB. I had resurrected it using a chain and a freewheel block cannabalised from other skip bikes last year. Last summer I acquired a pretty nice set of 26" wheels I intended to fit to it but with cassette hubs so I had no use for the freewheel block. The chainset was showing a fair bit of wear in the middle ring to begin with so I decided I would ride it to destruction before fitting my new wheels, chain and chainset. Replacement rear mech robbed from another skip bike as I think the jockey wheels in the current one may just possibly be a little worn.
It took around 3,000 miles to do that - as I say, they block and chain were robbed from other bikes so can't say much how many miles they had done in the first place.
All components basic Shimano from early 1990s.
Chain maintenance involved throwing some oil over it if it got noisy. It never seen serious off-road use but did get used in all weathers and often along dusty gravel paths.