How long does it take to obtain a one-year non-O visa extension in Thailand from a 90-day non-O visa?

The transition from a 90-day Non-O (retirement) visa to a one-year Non-O visa involves applying for an extension of stay rather than obtaining a new visa. Responses from the community indicate that processing times vary by location, with some offices offering same-day service, while others might take up to a month. Personal experiences shared show that processing times can range from 2 hours to 3-4 hours, depending on the office and day of the week.