What are the application timelines for a 30 Day Extension on a Tourist Visa in Thailand?

𝟭) 𝗛𝗼𝘄 𝗲𝗮𝗿𝗹𝘆 𝗱𝗼 𝘆𝗼𝘂 𝗡𝗘𝗘𝗗 𝘁𝗼 𝗮𝗽𝗽𝗹𝘆 𝗽𝗿𝗶𝗼𝗿 𝘁𝗼 𝘆𝗼𝘂𝗿 𝗶𝗻𝗶𝘁𝗶𝗮𝗹 𝗧𝗼𝘂𝗿𝗶𝘀𝘁 𝗩𝗶𝘀𝗮 𝗲𝗻𝗱𝗶𝗻𝗴?

you can apply right up until the last day you're stamped in for.

𝟮) 𝗛𝗼𝘄 𝗲𝗮𝗿𝗹𝘆 𝗖𝗔𝗡 𝘆𝗼𝘂 𝗮𝗽𝗽𝗹𝘆 𝗽𝗿𝗶𝗼𝗿 𝘁𝗼 𝘆𝗼𝘂𝗿 𝗶𝗻𝗶𝘁𝗶𝗮𝗹 𝗧𝗼𝘂𝗿𝗶𝘀𝘁 𝗩𝗶𝘀𝗮 𝗲𝗻𝗱𝗶𝗻𝗴?

Bangkok, Chiang Mai and a few other offices let you apply when you have 45 days or less left on your current stamp. MOST offices allow you to apply when you have 30 days or less, BUT Jomtien and another office or two will only let you apply when you have a week or less left 😮

With 80 offices in the country it's a crap shoot on the "how early" part 😛