Should I extend my tourist visa or activate my Non-O visa in Thailand?

fwiw as a landlord you only have 24h to file a TM30 so your TM30 will start yesterday or today

Your landlord can put in any date. There is no check for a previous tm30. Only the last one counts.

𝗔𝗹𝘀𝗼 𝘀𝗼𝗺𝗲𝘁𝗵𝗶𝗻𝗴 𝘁𝗼 𝗻𝗼𝘁𝗲, 𝗜 𝗱𝗶𝗱 𝗻𝗼𝘁 𝗿𝗲𝗰𝗲𝗶𝘃𝗲 𝗮 𝗧𝗠-𝟯𝟬 𝘄𝗵𝗲𝗻 𝗲𝗻𝘁𝗲𝗿𝗶𝗻𝗴 𝘄𝗵𝗶𝗰𝗵 𝗜 𝗸𝗻𝗼𝘄 𝗟𝗮𝗸 𝗦𝗶 𝘄𝗶𝗹𝗹 𝗯𝗲 𝘀𝘁𝗿𝗶𝗰𝘁 𝗼𝗻.

Wouldn't worry about the TM30 until you BOUNCE OUT/BACK to activate that Non-O visa entry. Then once you're back in on the new 90 day stamp have the land lord file the TM30

You definitely will need it along with the other documentation to get the year extension of stay at Chaengwattana after that 90 day stamp runs down

𝗔𝗺 𝗜 𝗯𝗲𝘁𝘁𝗲𝗿 𝗼𝗳𝗳 𝗲𝘅𝘁𝗲𝗻𝗱𝗶𝗻𝗴 𝗺𝘆 𝘁𝗼𝘂𝗿𝗶𝘀𝘁 𝘃𝗶𝘀𝗮 𝗳𝗼𝗿 𝟯𝟬 𝗱𝗮𝘆𝘀 𝗮𝘁 𝗟𝗮𝗸 𝗦𝗶

NO you're better off PRINTING out that PDF that they emailed you (which is your visa) then bouncing out and back to activate it

𝗼𝗿 𝗴𝗼𝗶𝗻𝗴 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝘁𝗵𝗲 𝗹𝗲𝗻𝗴𝘁𝗵𝘆 𝗱𝗮𝘆 𝗹𝗼𝗻𝗴 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗼𝗳 𝗴𝗼𝗶𝗻𝗴 𝘁𝗼 𝘁𝗵𝗲 𝗴𝗼𝘃𝗲𝗿𝗻𝗺𝗲𝗻𝘁 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝗱 𝗰𝗹𝗮𝗶𝗺𝗶𝗻𝗴 𝘁𝗵𝗲 𝗹𝗮𝘀𝘁 𝟯𝟬 𝗱𝗮𝘆𝘀 𝗼𝗳 𝗺𝘆 𝗡𝗼𝗻-𝗢?

There is no lengthy day to claim anything on that Non-O, you cannot USE an eVisa inside the country if you didn't enter on it. It's worthless until you exit/re-enter on that visa <- when as I said in my previous comment you'll get a 90 day entry stamp

Easy answer, there is no "claiming" the last 30 days of your Non-O , you would have to leave and re-enter the country to activate the visa, it can't be done in country. So easiest is the 30 day extension to your 60 day visa exempt.

Not a niche question or issue at all

You're FAR from the first person who applied for a thai visa thru the eVisa online portal too close to your travel date to thailand and not have it approved before you came here 😕

You got in on a 60 day visa exempt entry, NOW if the eVisa is approved you would have gotten an email with the visa PDF file in it.

That Non-O visa is VALID for 3 months <- meaning you have 3 months from the date it's issued to enter thailand on it and get stamped in for 90 days

You cannot activate that visa inside the country, so if you have it approved, print it out, then either use a service to take you to the border, stamp out of thailand on the 60 day visa exempt you're here on, stamp in and out of another country and then hand the PDF of the Non-O visa with your passport to the officer when you stamp back in and you will get stamped in for 90 days

OR

You could fly out and back to activate too. Any way you want to do it you have to exit/re-enter ON that visa to use it

AND

You get 90 days from the date you ENTER the country so you haven't burned any time up on that Non-O entry yet