This is where K-ETA differs from New Zealand's NZeTA or Australia's eVisitor, which each carry a single stay limit. K-ETA does not set one. Your permitted stay comes from the visa-waiver agreement between Korea and your country, and generally falls between 30 to 90 days.
Two travellers, same flight, different limits
Because the limit is by nationality, passengers arriving together with identical K-ETA approvals can be admitted for different periods. Check the figure for your own passport rather than a friend's.
The officer decides on arrival
The stay is recorded at immigration. Holding a K-ETA does not guarantee the maximum period, and it does not guarantee entry.
Extending is a separate process
Visa-free stays are generally not extended for convenience. If you need longer, the route is a visa applied for before travel, not an extension after arrival.
Overstaying carries penalties and affects future entry. Confirm the date recorded on arrival, not the one you assumed.
More about K-ETA
What is K-ETA
K-ETA is an electronic travel authorisation for visa-free travellers to South Korea. What it is, who it applies to, and why many nationalities do not need it right now.
Do I need K-ETA?
Many nationalities are temporarily exempt from K-ETA. How to check your own passport, and what applies if you are not exempt.
How to apply
Applying for K-ETA on the official site: what you need in front of you, where people get stuck, and what happens after you submit.
Cost
What K-ETA actually costs on the official site, why third-party sites charge more, and when the cost is zero.
What you need
What you must have ready to complete a K-ETA application, and the photo and name rules that cause most rejections.
Processing time
Official guidance on K-ETA processing, what makes it slower, and why no paid service can speed it up.