I have just completed my travel and arrival details on the Thim app, a full week before I leave the UK.
Although it has not been submitted it has been saved, I have received an e mail stating they will contact me 72 hours before my arrival to complete my health details.
Answer summary
The Thim app allows you to prepare your travel and arrival details in advance, but you can only submit the health declaration and related information a maximum of 72 hours before landing in Thailand. Multiple comments confirm the 72-hour rule, emphasizing the importance of adhering to this timeline and using the official TDAC site for submission.
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Wolf ******
You can only submit maximum 3 days (72 hours) before you land the TDAC and THIM is connected to it.