Most buses leave after 6 o'clock in the morning.
If you want to go to Kaili, you are advised to buy tickets one day in advance (you need to catch the first bus, and ask the ticket clerk by the way).
How many times a day (the shuttle bus from Sandu county bus station to Kaili is generally not less than three times a day), it is difficult to get an accurate number without the answer of the station staff.