Who is John Galt?
One of my favorite questions...
In before 40 days is up.
IET17 pointed this out:
quarantine (n.)
1660s, “period a ship suspected of carrying disease is kept in isolation,” from Italian quaranta giorni, literally “space of forty days,” from quaranta “forty,” from Latin quadraginta”forty,” which is related to quattuor “four” (from PIE root *kwetwer- “four”). So called from the Venetian policy (first enforced in 1377) of keeping ships from plague-stricken countries waiting off its port for 40 days to assure that no latent cases were aboard. Also see lazaretto. The extended sense of “any period of forced isolation” is from 1670s.
https://www.etymonline.com/word/quarantine