[wott]

> Cassette lifespan is entirely dependent on maintenance, but if you abuse your bike you will find the derailleur starts 'jumping' on shifts after 400-600 miles or so. For me, this is every 3 or 4 months.

Uh? What? :-)

I've done 10.000 km with my current cassette and chain, and it is still working OK. One gear starts sliding a bit when I put too much power, so I might check the chain one day, or maybe next year. I have a spare cassette sitting somewhere (it's been sitting there for a couple of years already), but I cannot be bothered to change it yet.

That's 10 to 15 times your numbers. According to them, I should have had troubles with my cassette after a 3-day trip with 200 km per day :-)

And compared to many people, I am not very cautious with my bike.