KeirOxley wrote: I can fairly comfortably hike 26 miles with a 6,000 ft climb over 10 hours, though my hiking is all up and down large hills so the highest I get is about 3,000 ft.
That sounds pretty good although I wonder if sustained steepness might be different. I have no idea what's a good "checkout hike" near you, but some good checkout hikes in S. Calif. include:
1. Anderson Peak via the Momyer Creek Trail
2. Mount Baldy via Bear Flats
3. San Gorgonio Mountain via the Vivian Creek Trail
4. San Jacinto Peak via the Marion Mountain and Deer Springs Trails
5. Mount Baldy from Wrightwood via the Acorn Trail, Pine Mtn, and Dawson Peak.
I'm sure others can contribute suggestions, but those are some high gain steep hikes that I could think of off the top of my head. If you can do one of those, you're probably ready for Skyline.
HJ