Our first attempt for 6000m peak. It's done in 2-3 days. We went with Climbing South America. The same night another approximately 30 ppl were summiting, the most in that month as I saw from the diary log between base and high camp. We were caught in a snowstorm, strong wind and low visibility prevented many to succeed, but we managed. You can read more here: https://www.czickontheroad.com/huayna-potosi-easy-6000-m-peak-climbing-bolivia