A lot depends on whether you are a beginner or expert. 35 miles is the recommendation for first timers taking it easy; 70 miles is recommended for those who want to finish near the top. Here is a lot more info on training for your first marathon: http://www.findingdulcinea.com/features/feature-articles/2008/august/Get-Your-Marathon-On.html
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If you a 70 kilograms you should train for 4 months running 10 km in the morning a going to the gym 3-5 times a week.