Hi - what time are the official buses for Luoyang→Shaolin Monastary/Temple→Zhengzhou?

To the temple, you may take a bus to Dengfeng from LY Bus Station. The buses are available from 5:30 to 15:30 at an interval of about 30 minutes. Upon arrival, take change to a shuttle bus to the temple.

To Zhengzhou, you may take a bus from Dengfeng Bus Station. The buses are scheduled from 6:00 to 20:00 at an interval of about 10 minutes.

Are there no direct buses from shaolin to zhengzhou?

Yes, there are direct buses to ZZ from the temple and you can easily find at the parking lot near the attraction (about 2 hours). Have a nice trip!