As per similar posts today I have been to MTT Bangkok for my 30day extension.
It was a breeze. Parked up right next to the building, straight through to document checking at counter K and was stamped and out of there within 30 mins.
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TLDR : Answer Summary
A user reported a quick experience obtaining a 30-day extension at MTT Bangkok, completing the process in about 30 minutes with no issues.
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