3, 5 or 7 days with 3,5,7,or 9 monks twice a day saying prayers. My former great grand mother in-laws funeral was 7 days as she was the mother of Two retired Military Generals, the government even sent a few military members from Bangkok along with a royal family member. Her retired military sons were given plaques signed by the King. The funeral cost was close to 600k Thb, but as funerals go money was donated and the book which is kept for each family denoted as such. That book is generally kept at the Wat or kept by the Phu Yai, who also happened to be my now ex-FIL. Total out of pocket was 200k. Luckily the military fund payed what was needed as well. 7 days was much to long, I was tired after 3 days, not much sleep.