olissa,
I have included a link that explains what an MS relapse consists of: https://multiplesclerosis.net/what-is-ms/relapse/
It stated in the link, "To be considered a relapse, the new symptoms or worsening of symptoms must persist for at least 24 hours and it must have been at least 30 days since your previous relapse."
This is something that my neurologist has also explained to me as well. I have started to keep a "journal" to help document changes, etc. and how long that they last.
I hope this helps.
Best,
Ashley Ringstaff
MultipleSclerosis.net Moderator