When should I extend my single entry tourist visa in Thailand?

The user is seeking clarification on the process for extending a single entry tourist visa in Thailand, specifically whether to wait until closer to the expiry date (February 15) or if they can apply for the extension anytime prior to expiry. Responses indicate that it is generally acceptable to extend the visa when there are 30 days or less remaining on the current entry stamp, particularly in Bangkok and Chiang Mai where the extension can be applied for with up to 45 days remaining. There's a discussion about the possibility of submitting the extension now due to potential issues around lockdowns and the lack of immigration offices in the Andaman side.