Peak Corn time: It will depend on the weather, but if it's a typical summer day, then I'd say between 11 and 12:30. Skiing off the summit is actully the best I've seen it, so if you do go to the summit to ski, plan on some extra time to get up there and back to the SW Chutes.
Traverse Back: The best way, in my opininon, is to continue sking down to the bottom of the chutes, bearing left across the flats at the bottom of the chutes. When you can't ski anymore, take the skis off and scramble down to the Around the Mountain Trail. It's at about 6,080 feet and it right next to a small waterfall (keep the creek on your right as you descend to the trail). Switch over to trail shoes and follow the ATM trail back to the South Climb trail. It takes over an hour to get back to Cold Springs trailhead. This assumes you didn't camp out and leave your gear at Lunch Counter.