What is the process to get a 12-month extension on a NON-O visa in Thailand?

The user inquired about obtaining a 12-month extension for their NON-O visa, sharing their experience at Nongkhai immigration where staff advised returning one month prior to the visa's expiration. Comments from the community clarified that most immigration offices typically require applications to be made when there are 30 days or less remaining on the current visa. Additionally, it was mentioned that the financial requirements for the extension, such as maintaining 800,000 Baht in a Thai bank account for two months, should be considered.