Can I apply for a one-year extension of my Non-O visa married to a Thai national one month before it expires?

The user inquired about the possibility of applying for a one-year extension of their Non-O visa based on marriage to a Thai citizen, specifically if this application can be made one month before the visa expires. A commenter confirmed that it is generally acceptable to apply for the extension when there are 30 days or less remaining on the current visa, with exceptions for certain locations like Chiang Mai and Bangkok, where the limit is 45 days.