how long does a dissertation paper have to be

Another useful clue is found in the Latin origin of the word – dissertation comes from a Latin word ‘dissertare’ = ‘to debate’.
A dissertation is a subject you chose for yourself. The first usage of the word in the English language in 1651 also gives a useful starting definition: “an extended written treatment of a subject”.

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References:

http://qbc.wa.edu.au/?qtgek=dissertation-how-long-each-section
http://askinglot.com/what-phrase-defines-muster