How long should my trip to Thailand be, to buy property?
The great thing is once you find a trusted lawyer, they can manage and do the whole transaction for you while you are overseas. Its very unlikely it will be done in 4 weeks. Things work a little slower here than in the west or even other parts of Asia.
Buying is simply signing a reservation agreement or sales and purchase agreement and sending the 10% deposit. After this the lawyer will do a due diligence to check all the legal and finances of the property/company are legit.
If its a lease or freehold the process is difference but typically allow for around 2-3 months for a transaction.
Disclaimer: I am the owner of a real estate company in Phuket and have experience with all types of real estate transactions for the last 10 years.