One year to get into Guiness Book

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I would think that something involving sheer stamina (most miles ran backwards, longest bowling, etc)

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Two totally different things imo.
Longest bowling marathon is obviously do-able if you have a pretty good amount of stamina.
Would still be difficult to bowl for 35 hours or whatever and obviously you would need to work up the strength in your arms to even have a chance. But it's at least possible for a determined and athletic dude.

Most miles run backwards I don't think you are going to even come close to unless you already run 70+ miles a week or something.