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@xavierdisley
For 2000-2800m you're looking at around 12-18% decline in Vo2 max and sustainable power output (ie anything aerobic). The longer you stay there the less decline, but it's only a few % even after being there for a couple of weeks. Untrained people (ie. really untrained) see much less of a decline in power output at altitude than trained athletes too.
I did a Vo2 max test at ~1600m in a climate chamber some years ago, not much fun and I lost well over 50w for maximal aerobic power (500w -> 450w)
Xav