They do a colorblindness test. I have mild colorblindness that's not noticeable and doesn't interfere with me at all, but it makes it so that I can't pass that test. Sucks.
Mine took 13 days, but I think they may have been having issues with their system when I applied in November. Should leave plenty of time to be safe :)
The Ministry of Foreign Affairs website and the Thai airways website says you need either proof of vaccination or a PCR test + $50,000 covid insurance, but Trunk says you don't need anything, you only need to follow the airline and destination countries requirements.
I contacted Thai airways to see if they can clarify, but have not received a response.