In summary, here was my marathon training diary from 2011. I kind of only planned the big distances, mainly basing them around and wanting to be able to run a distance of approx 20miles one month before the actual marathon date. Running is different for everyone, my only tip really is do try to get the big distance 2-3 hour runs done – the 10,16 and 20milers – they are tough and somewhat daunting, but try to keep relaxed, take it easy and just do them. You’ll look back and find them well worth it on the day. Looking back now, it’s amazing what you can actually do.