first you deposit all docs...takes 5 min if all in order. Then, you pay at the next window....just another minute. They will ask you to go back next day at 13:00 to collect passport ....will only take 2 minutes
try Ho Chi Minh. Consulate there are very nice and helpful. Send them a message asking what docs they require. Prepare them, and you will be done within 10min!!! Go next day to collect passport.....2 minutes