Thailand Visa Validity / Duration of Stay:

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TOURIST VISA: With issued visa, you can stay for up to 60 days. If you plan to stay more than 60 days you must apply for an extension with a Thai Immigration office once you arrive in Thailand. Visa can be extended for an additional 30 days.
BUSINESS VISA: With issued visa, you can stay for up to 90 days. Visa can be extended for an additonal 30 days by applying for an extension with a Thai Immigration office.

Visa on arrival through border crossing:
If you enter Thailand from a neighboring country by crossing a border, a 15-day stay visa is issued rather than a 30 day stay visa.

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