5hrs 49min to summit of Mt Williamson
9hrs 39min to summit of Mt Tyndall
14hrs 31min return to car
This was done via the standard class 3 variation starting from the Shepherd Pass trailhead to Mt Williamson's summit via the class 3 approach "West Face", over the glacially carved/talus covered Williamson Bowl, to the summit of Mt Tyndall via the class 3 approach "The Rib" and then back to the Shepherd Pass trailhead. The decision to do Tyndall as well was largely made due to the "excessive heat warnings" in the valley (+105 degrees) so we figured more time at higher elevation would be nice before dropping back down into the heat. We stopped quite a bit during our descent back down towards the trailhead.
My partner was with me hence the "supported" designation.