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I've been reading up on hydration and fuelling for long runs and the marathon, and one of the pieces of advice I came across was to drink 150 - 300ml every 20 minutes. I can't imagine taking on so much liquid during a race - I probably drink about 100-150ml after an hour and then the same amount every hour after that.
So, how much do you drink during a marathon? Does anyone actually manage to drink 450 - 900ml per hour?! (without needing to do a Paula during the race? )