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I'd say 10 hours is considered a good time for single if your trying to push yourself probably the equivalent of a 3 hour marathon for amateur runners. I've done the single 10+ times and my PB is 8:38 but that was all out and the last 40 or so miles i had a car looping round with food, drink and spares and a couple of mates riding with me pacing and getting the gates. The double is a totally different beast i attempted it once and got it all wrong needing medical attention and having to stop at Devils Dyke on the way back after less than 17 hours. The single can either be a really nice big day out or absolutely miserable depending on your approach to it as much as your fitness.
@Retro_bastard @sacredhart, interested to know what you'd consider a quick time for a single. Most talk re. records (FKT if you must) is about the double which isn't relatable for us mortals!