Is it possible to visit an immigration office to get an extention on my 90 days stamp for my Non-B visa? And if so, 7 days, 30 days? Or...?
TLDR : Answer Summary
The possibility of obtaining an extension at the immigration office for a Non-B visa is limited. Users suggest that while you can get a 7-day "extension denied" stamp for a fee, no longer extensions (like 30 days) are available. Instead, many recommend leaving the country briefly (border bounce) to reset your 90-day stamp.