The Adventures of Mackenzie Mortimer — Keith B. Darrell

Mackenzie Mortimer is a typical junior high geek. He's shy, awkward, a bit clumsy, late with his homework, and always late for class. There's never enough time to do everything he needs to do; after all, there are only 24 hours in a day. But when Mac finds his grandfather's pocket watch buried deep inside a trunk, he discovers his days have an extra hour. According to the eccentric inventor's journal, the pocket watch can add up to 60 minutes to a single day by freezing time around whomever holds the watch and presses its button.

The Adventures of Mackenzie Mortimer Omnibus Edition collects the entire trilogy: The 25th Hour, The Tomorrow Paradox, and All the Time in the World.