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What is the significance behind "40 days" that often appears in the Bible?

Several times within the Old and New Testament of the Bible there are notes pertaining to a long time as "40 days," as in 40 days of fasting, rain, traveling, etc. Why 40? Is there a factual association? The only thing I've noticed are references to 40 days needed for mummification in natron. Any insight? Thanks!