For those in a rush here is a quick summary:
Day 1: Started from Gurgaon 4:30 AM, parked for the night at some hotel in Mandi 5:30 PM
Day 2: Started from Mandi at 9:30 AM, reached the Lake at 12 noon. Stayed the night at a room in the temple. 4-5 small dhabbas/shops there to supply meals and confectionery. Camp able all year round.
Day 3: Started from the Lake at 9 AM, reached Gurgaon at 12 mid-night (we were Lucky to face no traffic or fog, plan to have an extra day at hand if you plan a bike trip in the winters)