I need to start doing longer climbs again to prepare for everest challenge. One of these days I'll come down and check it out and let you guys know how long it takes...
It's a great ride, most of it above 6000 ft, some above 7000, so it's cool enough in the summer.
I figure from Red Box to Wrightwood and back is about 95 miles with 10K, so for you or Keith or even TJ it could be around 6 or 6.5 hours. There's nothing real steep, but nothing flat, either.
You could start at the bottom of AC and make it a double metric with at least 12.5K, do a couple short add-ons and you could bag 14K.