If you go on sabbatical to Thailand for 3 months and apply for a visa with all the details like flight booked, accommodation etc. Then you get an approved e visa type tourist TR with validity date (issue date so not the date of departure) and expiry date (3 months after issue date and thus shorter than the actual date of departure from Thailand. Is this correct then and if not; which visa should we apply for?
TLDR : Answer Summary
When traveling to Thailand for a 3-month sabbatical, it's important to note that the validity period of an e-visa (like the TR tourist visa) indicates when you must enter the country, not the duration of your stay. Upon entry, you typically receive a 60-day stamp, which can be extended for an additional 30 days. For Dutch passport holders, you can enter Thailand visa-free for 60 days and extend this period without needing a visa.