40 days - See also the origin of the word “quarantine”
https://www.vocabulary.com/articles/wordroutes/40-days-of-solitude-the-origin-story-of-quarantine/
That's also interesting. Doing a quick google search I see that many believe 40 (days, etc.) in the bible is often related to a time of testing. This can be related to the period need for "transformation, great change, new life, new growth," as well as to a period of testing for disease.
Excellent. THANK YOU for the ping