Just asking in other topics is not the way to go:
Gary Wyse I will ask a question on this thead. I am going Thailand for 27 day December 2nd, can i book a hotel for 4 days for TM30?
he got some answers:
Are you leaving after 27 days or intending to extend?
[Gary Wyse]([members only]) leaving, back to the UK
What do you mean by "book a hotel for 4 days"? The TM 30 will be filed by the hotel.
In that case don't even think about the TM30. A TM30 non-filing will only bite you if you need to do business with immigration
[Gary Wyse]([members only]) Meaning is 4 days ok at immigration at bangkok
TLDR : Answer Summary
The TM30 is a requirement for reporting your arrival in Thailand, filed by your hotel within 24 hours of your arrival. Your stay duration (27 days) does not affect the TM30 reporting, and as a tourist, it is generally not a concern unless you need to interact with immigration.