i have no issues at Jomtiem. They can be a bit slow but otherwise friendly and efficient. It probably helps if your on the right visa and not gaming the system.
Can be as quick as 4 Days and as long as 4 weeks , never had one take longer than 4 weeks. I reckon you'd be close. My last one ( September )went from document checking to pending approval after 7 business days and then was about 10 more business days before it came through. But this is a very busy time of year.