The is the approx route we took. It took about 2.5 hours from the trailhead to get up into the basin below the scree. This involves some very steep bushwacking and class 3 climbing in places to get up into the basin. 45 minutes to the base of the snow, and for us approx 2-2.5 hours up the couloir. From the top - its only about 20 minutes around the back of the summit tower to the top.