Question: The king during  the 166th year of the Rattanakosin Kingdom of Thailand served for how many years and days?
Related documents: [0]  [DOC] The year 1948 was the 166th year of the Rattanakosin Kingdom of Thailand. It was the 2nd year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2491 (1 January – 31 March) and 2492 (1 April – 31 December) in the Buddhist Era. [END] 
[1]  [DOC] Bhumibol Adulyadej (Thai: ภูมิพลอดุลยเดช ; rtgs: "Phumiphon Adunyadet" ;  ] ; see full title below; 5 December 1927 – 13 October 2016), conferred with the title King Bhumibol the Great in 1987, was the ninth monarch of Thailand from the Chakri dynasty as Rama IX. Reigning since 9 June 1946 he was, at the time of his death, the world's longest-serving head of state, the longest-reigning monarch in Thai history and the longest-serving monarch having reigned only as an adult, serving for 70 years, 126 days. During his reign, he was served by a total of 30 prime ministers beginning with Pridi Banomyong and ending with Prayut Chan-o-cha. [END] 
Answer: 
70 years, 126 days
70 years, 126 days