@Bernie ******
&
@Kathy *******************
both of you are correct ๐ฎ
This is where the requirements can vary by embassy/consulate when getting a tourist visa
For single entry some require you show onward travel within the 60 days you'll get stamped in for BUT for others they'll accept onward travel within 90 days of your arrival date because they know you can apply for the 30 day extension
It is the experience of most people who applied for the METV online using the eVisa system that they show onward travel within the first 60 days after arrival and then show a flight back IN to thailand after that <- it's that leaving/coming back which "justifies" to the embassy you need an METV