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Vietnam visa on arrival lasting

I'm a Hong Kong citizen and I need to know how long I can stay in Vietnam after getting a visa on the airport? Thank you!
Vietnam visa extension service thumb

Requirements on arrival in Vietnam

Hi there, if i arrive in Vietnam with the approval letter, do i also need to bring passport size photos with me to give to the officials? If so, how many and what are the specifications of these photos?

Vietnam visa for exit by land

Hi there. Can i use Vietnam visa on arrival if I travel to the country by air and then exit by land?