So my wife called the London embassy for me and spoke to several people there about 90 day reporting. Their understanding is that DTV does *NOT* require 90 day reports and a visit to Immigration office is only required for extension. Obviously they are not Thai Immigration dept but I thought I would report it anyway. OK., Embassies and immigration have their own take on things, but it is understandable why people are asking.
Not irrelevant, if they issue visas that give you longer than 90 days in Thailand, then it should be stated in the application that you have to report every ninety days. If they give you a visa(DTV) that lets you stay in Thailand initially for ,180 days, then they should inform you when you apply that you have to report on day ninety.
Do you have a link that says you do with the DTV Visa? The visa gives you 180 consecutive days before you either get another 180 day extension, or leave and re- enter and get another 180 day stamp. This is a visa, not an O visa extension, which requires ninety day reporting.
Best thing to do depending on whether you have any pre conditions is to have a full medical, blood tests for liver, kidney, cholesterol & blood count. Also lung x ray, echocardiogram, Myocardial perfusion scan, which measures the blood flow through all arteries & blood vessels of the heart to see if there are any problems. Also there are blood tests these days to see if you maybe susceptible to some cancers. If you have these and get the all clear. Then just hope your plane doesn't crash on the way, or you don't get in a road accident once in the land of 😊 😂 😂 😂. Seriously though even if your in your later years, like myself & are in very good physical condition, weight & BMI, then even if you want some peace of mind with some sort of health insurance, try to get the impatient only cover, with the lowest patient cover, IE., 400,000 baht. Also to keep your premiums down accept whichever excess you are comfortable with. I lived in Thailand from the age of 50 to 61, never had health insurance, saved a fortune, but took the risk. Now I'm 76 & hoping to go back early next year & will not be taking out insurance, mainly because it doesn't matter how fit & healthy I am, just the fact of my age means the insurance companies look at people like me as a bigger risk than someone in their forties that might smoke, be overweight & physically inactive. It's the same in any walk if life D.O.B matters more than the condition of a person.
Ok, so on that basis you can stay for a full five years? Just do a border bounce on day 360 each year. Which would be good, unless you came across an IO., who wouldn't let you in because you were returning on the same day as you left.