Go there in high season when there is a cue of an hour already they open 30 minutes later, go for lunch 30 minutes earlier and open 30 minutes after schedule.
Whatever you want it does always take more than 2-3 hours!
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.