I have seen these various rules mentioned, especially on www.thaivisa.com . I think the 7-day rule is the before and after limit regarding 90-day reporting? The 15-day rule may be in regards to submitting an application for some type of one-year visa? For example, submit your application a minimum of 15 days before giving your application to the immigration office? 3-day rule is unknown, but read in a post. How strict are these rules? My interest is renewing my non-O visa for retirement. Thanks. Note: No need to contact me. I will look for an answer in your next Q and A video on youtube.com .