I summitted Denali’s West Buttress Route on June 19 2012 at 7:30 pm in 7 days on a trip following Mt. Everest. Alaska stays light 24 hours this time of year. It took 8 hours from 17,000 ft Camp to get to the summit at 20,310 feet. The hard part was descending all the way back to base camp to catch a plane out at 9 am. I think its the first time I remember sleepwalking!