We just returned from Thailand after 3 months. We do have a home in Nonthaburi and have our own car, so we get away with some of the expenses. We do take a little vacation every month, like 3 - 5 days, depending on the location etc. This year we spent in the range of 125,000 baht for 90 days. We usely budget for around 50,000 bath per month.
Will be in the future. As we come now for only 90 days we just get a Tourist Visa and the 30 day extension. Plan to move here in 2025 on a Retirement Visa
To spend my winters in Thailand, I used to get 3 each 60 day visas, resulting in me making 2 visa runs to the Cambodia border. Bit of a pain in the ass but it worked out OK