According to this Flowing Data chart, history graduate students write longer dissertations than any other discipline. The average history dissertation is just over 325 pages in length. Only anthropology comes close.
Historians Write the Longest Doctoral Dissertations
You might also be interested in Ben Schmidt on cyclical changes in the length of Princeton history dissertations.
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Um Spammern den Missbrauch des Kommentarsystems zu erschweren, fragen wir nach dem Ergebnis einer einfachen mathematischen Operation, bitte multipliziere 9 und 3 (*)