Here’s an excerpt from their blog:
Greetings from Everest Base Camp! We are safely back here after spending four nights at Camps 1 & 2. On April 19 we had a pre dawn breakfast and left EBC at 4:45am. We navigated a short way by headlamp then put on our crampons and began climbing through the Khumbu Icefall. After several previous acclimatization climbs we had become a very efficient climbing team and it showed as we made it past the Icefall and all the way to Camp 1 in a very respectable 4 1/2 hours arriving at 9:15.
Our goal by sleeping at Camps 1 & 2 was to continue the acclimatization process by living for a few days at higher elevation. We spent the rest of April 19 doing just that. We hydrated, read books, and generally relaxed as our bodies adjusted to this new elevation. We had previously reported Camp 1 to be at 6120m. After being there we are readjusting that elevation to 6100m/20,012′, which was still the highest altitude we had reached during the expedition up until then.
Armchair climbers can follow their progress at Sierra Mountaineering.