You sound so uneducated and hateful.
if you are a true music lover you would have known the history of longest running solo number #1s since the 90’s.
Whitney Houston, Elton John , Mariah Carey and Harry Styles had a 14 weeks tie. So there was no longest running solo artist song song until Harry breaks the tie with 15 weeks next week. Which I think he will do.
Mariah & Boys II Men held the record for the longest running number 1 song until Despacito tied it for 16 weeks, then Old Town Road broke the record with 19 weeks. All 3 songs are collaborations.
so to answer your question, Mariah never held the record for the longest running solo #1 song.
also all her #1 are questionable because her singles back in the 90s were discounted to 0.29 -0.49 cents, just so they could go number #1.
mariah and her record label always played dirty getting those number 1s. Most of them are not even memorable.