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"It seems that the plague's latent period was 10-12 days", says Chris Duncan, "while the infectious period prior to the appearance of symptoms lasted 20-22 days, giving a total incubation period of about 32 days. This is exceptionally long and it explains why the plague could jump very long distances even in the days of primitive transport: for three weeks, people didn't realise they had been infected. People generally died five days after the first symptoms appeared, so the average time from infection to death was about 37 days. This is an interesting finding, because European health authorities had quickly determined on 40 days as a safe quarantine period for the plague." [From legend to legacy]
Comment: The reader is encouraged to review this in-depth article which sheds more light on this subject: New Light on the Black Death: The Cosmic Connection by Laura Knight-Jadczyk.