I know that the International Circus at Chimelong is 7:30pm & its 1.5 hours show at night.

Here are the operating hours of the rest park as well as the interesting shows timing:
Paradise: It is open from 09:30-18:00 on weekdays and closes at 19:00 on weekends. Different shows are on between 09:30 and 17:00.
Safari Park: It is open between 09:30 and 18:00. Many shows are on from 10:30 to 17:00 and they are very frequently arranged at intervals of half an hour or an hour.
Crocodile Park: 09:30-18:00. Crocodile shows are at 12:30, 15:30 and 17:00. There are other good shows.
Water Park: 10:00-18:00. Except having fun there, some fascinating shows would be a feast of eyes and they are arranged from 11:30 to 16:00 (5-6 shows a day).

For more info, you can read the official website of the resort. And to my experience, three days would be proper to cover all the parks.