#9 Paige - 308 Days (NXT Women's Championship)
First things first, WWE recognizes Paige's NXT Women's Championship reign as 273 days. This is because the episode of NXT where she won the Women's Title was taped and aired 35 days after filming. However since she held the title for 301 days in total, I've gone with that number for her and all others on this list.
Paige won the Women's Title on an episode of NXT after beating Emma in the finals of a tournament. The tournament for the said title had 8 participating women. Paige defeated Tamina in the first round, Alicia Fox in the second and finally Emma in the finals. Future Champions Sasha Banks and Bayley were also part of the tournament although they both got eliminated in the first round.
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Her Championship reign ended in a unique way. She made her surprise Raw debut after WrestleMania 30 and won the Divas Championship from AJ Lee in her debut match. As a result, she moved on to the main roster. Thus, NXT General Manager, John Bradshaw Layfield stripped her of her NXT Women's Championship in the following NXT episode. She never actually lost her title.