My 30 day extension to my 60 day tr visa is due 24th September, how many days before should I visit immigration office to apply for my extension ?
TLDR : Answer Summary
To apply for your visa extension in Thailand, it's advisable to visit the immigration office at least a week or a few days before your current visa expires. In your case, since your extension due date is September 24th, aim to go before September 19th to avoid any issues with missing documents or processing delays.