Can I apply for a Thailand non-O visa in Vietnam and do a border run while waiting for the visa approval?

A user inquired about the possibility of applying for a Thailand non-O visa in Vietnam with limited time on their Vietnamese visa. They wondered if they could enter Thailand and then do a border run back to Vietnam while waiting for their visa to be processed. Responses indicated that while it might be possible to leave and return without issue, it is generally advised to stay in the country of application until the visa is issued. Some users shared their experiences, confirming that visa processing times can be relatively short, but it is best to keep documentation handy for evidence of travel.