Using the TM.7 application form can the DTV be extended once per entry stay for up to an extra 180 days, which means you could stay in Thailand for a total of up to 360 days (180 days + 180 days) without leaving Thailand?
TLDR : Answer Summary
Yes, the DTV visa can be extended for an additional 180 days using the TM.7 application form, allowing for a total stay of up to 360 days without leaving Thailand. However, this process requires all original documents and may be challenging at certain immigration offices, prompting many to choose border bouncing for ease of obtaining the next 180-day stamp.
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