How long does it take to check in at Tianhe Airport?

Two to three hours. According to official website of Tianhe Airport, you should check in at the airport two to three hours in advance. Processing flow:

1, get the boarding pass first, and then go through the security check.

Secondly, go to the boarding gate designated on the boarding pass and wait.

Boarding begins half an hour before the departure time of the flight on the last ticket.