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Am running my first marathon (london) in April and am after a bit of advice please. According to several different calculators they are giving me a finishing time of around 3:15, I think this is unrealistic so am basing all my training paces (am using the Mcmillan running website) on a finishing time of 3:30. Has anyone else found these pace calcultors to be accurate for a marathon? Obvioulsy this is my first and being London I don't know how congested it is?
My pb's in the last 6 months are:- 5K :-20:25, 10K:- 42 Mins, Half33.
Thanks for any advice I just dont want to get myself injured thinking I can acheive an impossible time!