you can get two years out of it by exiting the country before the end of the first year and then re-entering with another 12 months health insurance. At the end of the second year you will have to depart and do a brand new o-a application
You can convert to a. O visa based on retirement but you will have to lock up
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0 baht in a Thai bank account for a few months and you will not be allowed to let that drop below
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0 during the year if you think you would like to extend past a year. Alternatively, if you think you want to stay for just a year (or possibly two) but don't want to lock the money up, you can apply for an O-A visa in your home country. You just have to show you have the equivalent funds at hand but you can keep them wherever you like
Is the internship and studying finishing when the ed visa ends? Are you planning on continuing to work there or do you just want to travel around the country when it ends?
nope you need to show funds equivalent to that in your home country. If you get a multi entry visa you can also exit and enter just before your year is up and get stamped in for a second year. I'm currently on one myself. Feel free to DM me if you've further questions