When should I apply for an extension for my Non-O visa in Thailand?

The best time to apply for your Non-O visa extension is typically 30 days before its expiration date, based on guidelines from most immigration offices in Thailand. However, it's essential to check with your specific local immigration office as procedures may vary. Additionally, remember that the timing for applying can also depend on the date you entered Thailand and the expiration of your 90-day entry stamp related to the visa.