Bianca Belair became the longest reigning women’s champion of the modern era on the main roster, crossing 400 consecutive days as Raw Women’s champion.
The previous record was held by Becky Lynch who held the title for 398 days before she had to surrender it due to her pregnancy.
You have to go back to 2005 and the WWE Women’s title to find someone who held the title longer than that. It was Trish Stratus, who won it at New Year’s Revolution in San Juan in January of that year, losing it to Mickie James at WrestleMania 22 in April 2006 for a title reign of 447 days.
Bianca’s next milestone after possibly surpassing Trish Stratus will be 501 days, a record held by Rockin’ Robin from October 1998 until the title was deactivated in February 1990.
NXT had three women who held the NXT Women’s title over 400 days, with Mandy Rose at 413, Shayna Baszler at 416, and Asuka at 522.