CD
Leave trail by midnight, sunrise on the summit, alone if you're lucky, back to car before noon, if your fast. My fastest time was 9.5h C2C (no skis), but that was early June, and I brewed up at the base of the Roman Wall. Watch crevasses at the top of the snowfield above the hogsback, they are more open in the last few years than usual, and if it's dark it's a non-descript area, easy to get too far to the right or left. Aim for the rocks that peek out on the sky line, and take them on the left, get too right, gets steep, too leftr, crevasses.