A magic box has pennies in it that double every minute. If the box takes a full hour to become compl

A magic box has pennies in it that double every minute. If the box takes a full hour to become completely full, how long does it take for the box to become half full?

At the hour mark, it's 100% full. Half full means 50%. Since it doubles every minute, then at the 59th minute, it's half full.