i have been suffering with Bangkok bank for last many years. They love papers, just transfer the money at counter, they need your passport, passbook, and keep copying every pages then they will ask u to sign.
Not only the bangkok banks, all banks in Thailand love to waste papers..
I have LTR for 10 years got around march this year. Total process took 1.5 months. Condition is min passive income, co audit report, and tax assessment of your country.