Q. Is it possible to travel Pangong Lake from Leh and come back in a day?
Absolutely, it is very much possible, you just have to start early (4:00 AM) from Leh City if you want to cover Leh to Pangong in a day & be back by evening. It will take you at least 5-6 hours to get to Pangong & another 5-6 hours to return back.