Mres dissertation timescales question

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I will be doing an Mres in history for the coming academic year (2015/16) and will need to submit a 20,000 dissertation. This will constitute a third of the total marks of this one year full time course. Can anyone advise me roughly when I will need to sort my dissertation title by, when I would probably need to submit the final thing by and the most important question of all, how long (months) would you advise I set aside to do this dissertation? Many thanks

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