Most weeks on  best seller list
Who
Unknown
Where
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The longest duration on the New York Times best-seller list (founded 1935) is that for The Road Less Traveled by M. Scott Peck, which on 14 Apr 1995 had its 598th week on the lists. Over 5 million copies of the book, which is published by Touchstone (a division of Simon  Schuster), are currently in print.