@Steve *******
in order to be able to apply for the "change of visa type" from the visa exempt-entry to the initial 90-days Non-Imm-O Retirement Visa, you need to SHOW a minimum of 800,000 THB in your Thai bank account. No seasoning time needed at this point but you must prove the money came from abroad. Then as soon as the 800K have been sitting in your account for 2 months and before the 90 days expire, you can apply for the "1-year extension of temporary stay permit based on retirement"