I booked MY trip from Gangtok.It took 6.5 hours to reach Lachung. br I stayed overnight in a Hotel and set out for Zero point and br Yumthang valley next day at 6 : 30 am.All Costs were included br in trip.Only Zero point was extra(PER PERSON RS. 200-).After the trip toLachung expect to reach Gangtok at around 7.30 pm in the night.This is one of the best places I have visited.Truly a paradise on earth. Feels on the top of world.Chilling cold and breathtaking (hypoxic) environment.This place is worth of driving 1.5 hours from Yumthang & 3 hours from Lachung. zero point, the view of the majestic peaks of the Himalayas will make you feel that your whole br existence is completely insignificant. For more information comment on comment box .