Hi Jean, I ascended Mera Peak a few years ago, walking in all the way from Kathmandu. We did it over a three week period and everyone acclimatised successfully. The summit provides a superb view of Everest, Lhotse and Nuptse, and the early morning light is fantastic. Interestingly, it was the smokers that acclimatised fastest! Each person had a different critical altitude where they started to feel the effects of oxygen deprivation. Mine was about 16,000 feet.
What aspect of acclimatisation are you proposing to research?