Question: The king during  the 166th year of the Rattanakosin Kingdom of Thailand served for how many years and days?

Context paragraphs:
1997 in Thailand: The year 1997 was the 215th year of the Rattanakosin Kingdom of Thailand.  It was the 51st year of the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2540 (1 January – 31 March) and 2541 (1 April – 31 December) in the Buddhist Era.  It is most significantly marked by the 1997 Asian financial crisis, which began when the Bank of Thailand floated the baht on 2 July, as well as the promulgation of the 1997 Constitution of Thailand.

2011 in Thailand: The year 2011 was the 229th year of the Rattanakosin Kingdom of Thailand.  It was the 65th year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2554 (1 January – 31 March) and 2555 (1 April – 31 December) in the Buddhist Era.  The year saw the election of Yingluck Shinawatra as prime minister, as well as the worst flooding in the country's history.

1948 in Thailand: 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.

1982 in Thailand: The year 1982 was the 200th year of the Rattanakosin Kingdom of Thailand.  It was the 36th year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2525 (1 January – 31 March) and 2526 (1 April – 31 December) in the Buddhist Era.

1992 in Thailand: The year 1992 was the 210th year of the Rattanakosin Kingdom of Thailand.  It was the 46th year of the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2535 (1 January – 31 March) and 2536 (1 April – 31 December) in the Buddhist Era.  It is most significantly the year which saw the events of Black May, a pivotal moment in Thailand's political history.

2012 in Thailand: The year 2012 was the 230th year of the Rattanakosin Kingdom of Thailand.  It was the 66th year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2555 (1 January – 31 March) and 2556 (1 April – 31 December) in the Buddhist Era.

Bhumibol Adulyadej: 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.

1960 in Thailand: The year 1960 was the 178th year of the Rattanakosin Kingdom of Thailand.  It was the 14th year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2503 (1 January – 31 March) and 2504 (1 April – 31 December) in the Buddhist Era.

2006 in Thailand: The year 2006 was the 224th year of the Rattanakosin Kingdom of Thailand.  It was the 60th year of the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2549 (1 January – 31 March) and 2550 (1 April – 31 December) in the Buddhist Era.  Major events include the celebration of King Bhumibol's Diamond Jubilee, and the intensification of the 2005–06 Thai political crisis, which culminated in a coup d'état on 19 September.

2010 in Thailand: The year 2010 was the 228th year of the Rattanakosin Kingdom of Thailand.  It was the 64th year in the reign of King Bhumibol Adulyadej (Rama IX), and is reckoned as year 2553 (1 January – 31 March) and 2554 (1 April – 31 December) in the Buddhist Era.  The year saw large anti-government protests which led to a violent military crackdown in May.

Supporting paragraphs: 1948 in Thailand Bhumibol Adulyadej
Answer: 70 years, 126 days