What documents and fees are required to extend a tourist visa while in Chiang Mai, Thailand?

The user seeks guidance on extending their current 60-day tourist visa in Chiang Mai, which expires on October 5, as they wish to stay until October 22. They inquire about the necessary documents, fees, and the process involved, feeling overwhelmed by the available information. Commenters suggest bringing the following documents: passport, passport photos, copies of the ID page, visa page, entry stamp, and filling out the TM7 form. The fee for the extension is noted as 1900 Baht, and additional comments mention the TM30 form may also be required. Users share personal experiences regarding the time taken for the extension process.