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542.60 decades is about 150 times as long as Pius IX's reign
In other words, it's 171.5 times the length of Pius IX's reign, and the length of Pius IX's reign is 0.00583 times that amount.
(a.k.a. Pope Blessed Pius IX, a.k.a. Giovanni Maria Mastai-Ferretti) (1792-1878)
The longest reigning Pope in the Church's history, Pius IX reigned from June 16th, 1846 to February 7th, 1878 — 3.1650 decades. As the last monarchical Pope, he ruled over 3,000,000 subjects in the Papal States until 1870.
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