Amulet of Timekeeping

This simple hexagonal amulet is inscribed with three lines connecting points and crossing in the center. Upon command, the six sections of the amulet slowly turn color, one at a time. Each color shift is gradual, taking 10 Minutes. When the last section completes it's color shift, exactly one hour after the command, the entire amulet returns to it's original color and resumes the process. It stops keeping time on command of the user.  The amulet functions only on the Prime Material Plane and stops mid-change if taken to another plane.