Just crossed the 1,000 mile mark with this bike yesterday and still loving it! Those have been some tough, rocky, Northeast miles. Aside from a rim ding and a broken spoke (just last week) all is well. Still on the original everything that I built it with. I'm going to change the chain, cassette, tires and pads and pound the crap out of it for another 1,000. Maybe try out some oval chain rings too.
So that was July till April to log 1000 MTB miles. Along with plenty of road bike miles. I know some guys log that in a month, I'm just noting it as a milestone.