Re entering Vietnam every 90 days

Longest visa to stay in Vietnam is 3 months, 'letter of approval' must be arranged before entering country and has to happen by air into one of major airports.

To remain pretty much indefinitely Is it possible to arrange 'letter of approval' while still in Vietnam then take a flight on 89 day just before visa ends to some neighboring country (lets say Laos) and then next day fly in and get another 3 months stay? Or there has to be some timespan in-between?

Edit: As per @mts suggestion: I am citizen of Lithuania (European Union)

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How many times can you renew a tourist visa in Vietnam?

Renewal of a tourist visa The maximum length of time you can renew your visa for is three months only. You can upgrade your current one-month visa to one of three months, or from a single-entry visa to a multiple entry one.

How long can you stay in Vietnam as a tourist?

Visa waivers allow for visits to Vietnam for up to 15 days without needing to apply for a visa. See Visas section for more information, including for those wishing to stay longer than 15 days. Travellers to Vietnam must wear a mask and follow handwashing and other COVID-19 requirements.

How can I stay in Vietnam for more than 30 days?

Vietnam Visa on Arrival If you are planning a multiple-entry visit or a stay of more than 30 days, you will want to apply for a visa on arrival. To do this you'll need: A 4x6 passport photo with a white background and no glasses. A filled-out visa application form.

Can I stay in Vietnam for 6 months?

Those people having a 5-year Vietnam visa exemption certificate are allowed to stay in Vietnam for 180 days at maximum for each visit. If they want to stay longer than 180 days without leaving the country, they can extend visa in Vietnam. The extended duration is up to 6 months.

How To Stay In Vietnam For Longer Than 30 Days - 3 Ways To Stay In Vietnam Long Term Legitimately.

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Quang Nguyen Vinh, Quang Nguyen Vinh, pei chen, Thịnh La