Approximately 17Km, 4-6hrs, 80m ascent, 1650m descent.
The distance and walking time will also depend on where you camp. Your campsite may be at Gunnitsawa or further down in the village near Shana, in which case the walk will be shorter.
About four hours of walk, with gradual decent or mostly plain walk brings us back to the trail-head at Drukgyel Dzong