my own experience:-

appointment 1130am, arrived at 1100am and waited at the first hall. (they group it into different appointment time ie 11am, 1130am, 12pm, etc) so no need go too early.

once 1130am, still need to wait further as they go in by batch. waited till 12pm then only enter to the second hall.

in the second hall, took the queue number, and waited again. i think about 15mins. then go for registration. the staff/doctor will check the form. on that day, they got both sinovac/pfizer (suprisingly allow to choose). but limited stock for sinovac. (if not mistaken, 200 vs 2000 pfizer) but decided to take sinovac since less side effect as advised by the doctor.

then waited AGAIN to jab. i think waited for 20mins++ as they only have ONE counter for sinovac. and totally no queue management at all. and the ppl there just jump queue and no one managing it at all.

after jab, go to the next counter to do some final checking (eg next appointment, etc)

then go to the final area for rest. maybe depends on the vaccine, got 15mins and 30mins wait. you can just go home after the 15mins/30mins. no need to tell anyone (according to the staff there) but got some staff stationed there, so i guess if you not feeling well you can tell them.

overall, spend too much time waiting like in a bank. they could've streamline the process further.

MITEC as per this thread...