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As it was a professional wrestling championship, the championship was not won not by actual competition, but by a scripted ending to a match determined by the bookers and match makers. On occasion the promotion declares a championship vacant, which means there is no champion at that point in time. This can either be due to a storyline, or real life issues such as a champion suffering an injury being unable to defend the championship, or leaving the company.
Hornbaker (2016) p. 550: "Professional wrestling is a sport in which match finishes are predetermined. Thus, win–loss records are not indicative of a wrestler's genuine success based on their legitimate abilities – but on now much, or how little they were pushed by promoters"
Duncan & Will (2000) p. 271, Chapter: Texas: NWA American Tag Team Title "Championship held up and rematch ordered because of the interference of manager Gary Hart"
Duncan & Will (2000) p. 20, Chapter: (United States: 19th Century & widely defended titles – NWA, WWF, AWA, IW, ECW, NWA) NWA/WCW TV Title "Rhodes stripped on 85/10/19 for not defending the belt after having his leg broken by Ric Flair and Ole & Arn Anderson"
Duncan & Will (2000) p. 201, Chapter: (Memphis, Nashville) Memphis: USWA Tag Team Title "Vacant on 93/01/18 when Spike leaves the USWA."
The exact date Neidhart lost the championship has not been documented, putting her title reign at between 26 and 93 days.
The exact date Adonis won the championship has not been documented, putting his title reign at between 1 day and 68 days.
The exact date the championship was abandoned has not been documented, putting the title reign at between 753 and 782 days.
References
Hornbaker, Tim (2016). "Statistical notes". Legends of Pro Wrestling - 150 years of headlocks, body slams, and piledrivers (Revised ed.). New York, New York: Sports Publishing. ISBN978-1-61321-808-2.
Duncan, Royal; Will, Gary (2000). Wrestling title histories: professional wrestling champions around the world from the 19th century to the present. Waterloo, ON: Archeus Communications. ISBN0-9698161-5-4.