Marchetti’s Constant is a term for the average amount of time  spent travelling each day, which is approximately one and a half hours.  Developed by Venetian physicist Cesare Marchetti, it posits that although forms of urban planning and transport may change, and although some live in villages and others in cities,  people gradually adjust their lives to their conditions (including  location of their homes relative to their workplace) such that the  average travel time stays approximately constant.[1][2] Even since Neolithic times, people have kept the time at which they  travel per day the same, even though the distance may increase.



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