I honestly thought I would suffer a lot more up Huayna Potosi, as I was having difficulty getting enough oxygen into my lungs at 5,300m on Nevado Pisco. The conditions on Huayna Potosi were great, however, and I didn't suffer (perhaps to my disappointment...), feeling great during the entire climb. I think I've gotten in much better shape since Pisco, too, and gotten more adjusted to the +3,700m altitutde. On the way down, I offered to carry some of my fellow climber's gear, almost feeling sad that the mountain hadn't pushed me to my limits -- and that I hadn't "touched the void."
It's a relaxing 3 hour hike up to the refuge from the base camp, which includes a lovely refuge complete with hot showers and a fireplace. I think it can easily be done in 2 hours, but our guides seemed to insist that we were all whimps and needed frequent breaks. We didn't have any donkeys, which I suppose made it a much more "pure" climb, and I carried all my equipment -- plastic boots, two ice axes (only one was necessary, however), crampons, harness, three liters of water -- up to the refuge at 5,300m.
At the refuge on the glacier, we melt some snow for a warm tea before setting off at 3 am for the summit. Two guides accompanied two Israelis, an Englishwoman, and myself. We heard it was a four to five hour climb, and we managed it in almost exactly four hours, summiting at 7:08. The climb wasn't technical at all: the only two parts that necessitated ice axe usage were a 50 degree ice wall at about 5,700m, and then a narrow ridge about 30m before the summit. Unfortunately for me, a lefty, this required using the ice axe in my right hand. Although my right arm is more or less as strong as my left, it was a bit like trying to play tennis with my right arm -- each ice axe strike was a pathetic mis-hit on the ice.
Don't worry, this won't become a mountain climbing blog, as I'm about to head out of the Andes and into the eastern part of South America -- Paraguay.