How often do the shuttles run and when do they begin?

24/7 during peak hours every 15 minutes, between 1:00 to 4:00 am every 20 minutes

The shuttles run all the time, usually you don't have to wait more than 15 minutes.

Usually every 15 minutes But sometimes waiting time at station just 5 minutes or below

EVERY 15 MINUTES. 24/7