In and out in less than 4 hours - 3h20 of that was waiting time.
All very smooth and professional with the guy at the exit even wishing me good luck.
I would advise getting there by 6:30am.
Hope this is helpful for those concerned.
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TLDR : Answer Summary
A recent experience at Muang Thong Thani detailed the process of extending a Tourist Visa for an additional 30 days. The process included multiple screenings and document checks, resulting in the visa extension being completed in approximately 3 hours and 20 minutes of waiting time. It is advised to arrive early to ensure a smooth experience.