According to this article it was 45 days, but it doesn't mention exact dates.
This phrase made me think... "That doctor – he’s the only person in my life I can honestly say I will never forgive. "
https://www.benzoinfo.com/celebrities/stevie-nicks/
But it seems it was circa 1993
https://faroutmagazine.co.uk/stevie-...ription-drugs/