Man of Honour
When I've looked after 10 speed chains really really badly they've lasted as little as 1000-1500 miles (on a pre-worn cassette iirc). Decently looked after ones last more like 3000 miles for me. That's with using a cheapo chain wear indicator. I tend to err on the side of letting the chain go a little further than the wear indicator says I should due to the fact the cheap indicators are kind of rubbish and really don't properly measure things.
There are lots of factors that can affect chain life so I think it's pretty normal to see quite a large variation.
There are lots of factors that can affect chain life so I think it's pretty normal to see quite a large variation.