Dharamsala’s distance from Rewalsar is 154 km approx.
I started solo from Rewalsar by Royal Enfield Thunderbird Twinspark motorbike via National Highway 20 and reached Dharamsala in 5 hours 30 minutes.
It was the rainy season, and few places there were landslides.
Maybe if no rain, then from Rewalsar to Dharamshala 5 hours will be the total journey hours.
Rewalsar to Manali distance is 135 km approx.