How soon can someone with a multiple entry 1 year non-B visa apply for an extension in Thailand, and does it affect the 90-day exit rule?

A holder of a multiple entry 1 year Non-B visa can apply for an extension of stay between 30 to 45 days before the visa's expiration date. However, applying for a yearly extension may invalidate the multiple entry visa, making it necessary to obtain a new re-entry permit if the extension is granted. It is important to note that for this type of visa, the holder should exit Thailand every 90 days, a practice often referred to as 'border-bouncing'. This process allows individuals to maximize their stay, extending their time in Thailand beyond the original visa duration.