It does not matter how long somebody stays, it also does not matter what kind of Visa or Visa Exempt Entry somebody has. It is the duty of the land owner, house owner or house master (a Foreigner with a lease/rental contract) within 24 hours after arrival to report the foreigner using the TM30 form. BUT it depends on your Immigration Office, Bangkok don't care, Pattaya/Jomtien and Chang Mai will fine you 1.600 Thb if not done and you show up for what ever you need. Phuket even want a Power of Attorney if your landlord or house owner does not want to join you. So Yvonne,
@Mi**
, Hans, I hope you read this comment and use it in next comments.