How many miles have you ridden in 24 hours?

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I hope I am posting this in the right section first off and sorry if not. I am riding in a charity ride this Friday it is a 24 hour event they close off a 3 mile loop and you ride as much as you want every time I have done this ride in the past I have ridden at night rode a century and left this year I would like to stick it out as long as I can and see what kind of mileage I can put down. I was just wondering what is a reasonable goal? I know it will vary for people but for someone who races and rides though out most of the week. I was also wondering if anyone had any suggestions like what to do the week before the race to get ready, what to do in-between breaks and how long to rest off the bike because they will have tents available to get a few Zzzzzs if needed, any help is much appreciated.