I'd say 2 in the ravine and then one long run down the Sherburne trail. If you get there at 10, expect to be at the lower headwall by noon. Chill for 30 min. Hike the headwall for 45 min. Ski down. Depending on the time of year, some exposures become too sketchy to ski around 2 and you'll spend another 20-30 min going to another exposure.
I highly suggest you start hiking around 6 or 7 am. You'll get a full, enjoyable day out of Tucks that way.
It's not that you can't ski ice. It's that you can't ski and the ice proves it.