Bus From The Airport To Pattaya Just After 08 Pm 30

My plane from Chiang Mai will land to morrow (09/08/08) at 08:15 PM so it is too late for Bell Busses.

I also read from the answers of another post that I could try to go to the bus terminal but I am afraid that if my plane lands at 08:15 PM I won't have enough time to collect my luggage and take the free shuttle to the bus terminal and be there before 08:30 PM...

My question :

I remember that I took an ordinary bus to Pattaya at the airport (ground level, revolving door 9 ?) right by the Bell company.

What time do these ordinary busses leave the airport (AND NOT THE BUS TERMINAL) at night ?

Thanks for your help.

Eric