Loop of San Antonio, Harwood, Thunder, Telegraph, and Timber

I know this would be a long day, but how long? Eyeballing it on Google Earth, I'm thinking 7000 vert, but what kind of distance? I've never hiked this area, but I was thinking start the loop at the Old Baldy Trail, summit San Antonio, and then follow the ridge, bagging each peak, until I hit the trail that leads down through Icehouse Canyon. Then I'd just walk back down Mt. Baldy Rd. to my car at the Visitor Center. Has anyone done this before? Any suggestions? Thanks!