I successfully made Whitney last week. I was the slowest person in the group. The group kept going and left me. I got a wrong direction from a couple hikers. Then, I was cliffed-out and rescued by several hikers who heard my whistle brewing. The hike took 14 hours and 20 minutes in total for me including over one hour for being cliffed-out and rescued and breaks. So I do not think I was slow. I was just the slowest in the group. It was the scariest experience in my life. I made sure we would hike as a group and stay together on the trail in advance. But once we started the hike, nobody cared about it any more. If you hike with a group, STAY TOGETHER! DO NOT LEAVE ANYONE ALONE ON THE TRAIL.