In reply to Red Rover:
I've just got back from trying the traverse. We left Friday night from Kongsvoll(886m) and walked to Reinheim cabin(1341m). The walking is easy, guide says between 3-5hrs. Watch out for Musk Ox, we got too close due to low light and got charged by a big bull and its a scary experience. We bivvied 300m from the cabin and started out at 07:30 Saturday morning in great weather. Guide book suggests 2-4 to the main summit of Snøhetta(2286m. There was alot of snow on the way up and the wind picked up as neared the topp. The route was caked in snow and there was a storm on the summit. We met a Norwegian climbing and a French team that were bailing due to weather. We walked to Midttoppen(2278m) but realised it was too sketchy and bailed too.
I suggest going from Snøheimen cabin as its a shorter approach. There is a bus which takes tourist from the main road along the dirt track to the cabin. From here you can chose to either start the traverse from the main summit or in reverse from Vesttoppen(The west top)to the Main summit.
I did a solo fast and light trip from Kongvoll to the summit in 5hrs. So if you are in good shape and start from Snøheimen cabin, i reckon it could be a 5-8hr round trip.