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7%

The guards change over between 10:16pm and 10:25pm which means the hallway is clear during that time. How many minutes do you have exactly to cross the yard without being noticed?

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Interesting fact:

Approximately one third of all 30-year-old men who are not working, are either in prison or are unemployed ex-prisoners. Almost half of ex-prisoners have no reported earnings in the first several years after leaving prison.