What is the earliest I can extend my 60-day tourist visa in Thailand before it expires, and will a previous refusal affect my immigration process?

The earliest you can extend your 60-day tourist visa depends on the immigration office. Generally, some offices allow extension applications 45 days before expiration, while others may allow it as early as 30 or 15 days prior, with Jomtien allowing 7 days in busy times. Additionally, prior visa refusals might raise concerns at immigration, so it would be wise to prepare for potential inquiries.