We were very excited about this activity and decided to get a Didi there and arrive between 230-330. There were still plenty of tour groups but we took it easy and pit 1 at 4:30 was INCREDIBLE! Even with crowds people move on quickly and we never had an issue seeing what we wanted and getting photos. This is an amazing place to visit and the scale of it is mindblowing honestly. I would note that after you leave you exit via a huge area with food and souvenirs, almost like a small town. There are so many options and everything is cheaper than in the main complex. Not sure why noone mentions it. You can get souvenirs for a quarter of the price of the souvenirs inside and you will have to leave via this exit so cant miss it. 100% recommend as a great way to spend a few hours!