Can I apply for an extension on my Thai Non-Immigrant Visa O after 45 days instead of waiting 60 days?

The user inquires about the timeframe for applying for an extension on a Non-Immigrant Visa O in Thailand, asking whether they can apply after 45 days if they already have the necessary funds in the bank for 60 days. Comments indicate that in Bangkok and Chiang Mai, applications for extensions can be made with 45 days or less remaining on the current visa. Most other offices, however, require applicants to have 30 days or less remaining.