Just for comparison purposes, the conventional wisdom "average" dayhike ascent time is about 10 hours.
I don't mean to take anything away from the original poster's accomplishment, but what is your 10 hour "average time" number based on? From what I've read, 10 hours would be a pretty slow time. Some sources:
http://www.dayhiker.com/directory/MtWhitney.htmSays 5 hours is fast, 7-8 hours is average, 10 hours is slow
https://sites.google.com/site/mtwhitneytrailinfo/Says 10-20 hours round-trip
http://calitrails.com/2012/06/29/mount-whitney-dayhike-10000-calories/Took 7:45