#6 The New Day as WWE (then Raw) Tag Team Champions - 483 days
The New Day won the then-WWE Tag Team titles at SummerSlam in 2015 in a multi-tag team match. They would go on to reign throughout the rest of 2015 and almost through the entirety of 2016, going through the original draft in the current brand split. Drafted to Raw as champions, their titles were renamed as the Raw Tag Team Championship.
During this time, they began their long and still ongoing rivalry with former opponents Sheamus and Cesaro. The two would go on to finally end the New Day's long run with the titles at Roadblock: End of the Line in December 2016.
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At the time, it was the third longest reign of the modern era, but in the two years since, more champions have stepped up to make their mark.