How long does it take to get a visa extension in Chiang Mai, and is one passport photo sufficient?

In Chiang Mai, getting a visa extension shouldn't take all day; it typically takes less time compared to Bangkok, which can take around 3-4 hours. To process the extension, you will need the TM.7 form (provided at the office), one passport photo, and photocopies of your passport's picture page, current visa, entry stamp, and TM.6 departure card. The fee is 1900 THB. It's advisable to prepare all the necessary photocopies ahead of time, and you might want to bring a pen as they usually do not provide one.