Original: At this distance, signals from Voyager 1 take more than fifteen hours to reach its control center at the Jet Propulsion Laboratory, a joint project of NASA and Caltech in La Cañada Flintridge, California.
Simplified: At this distance, signals from Voyager 1 take more than thirteen hours to reach its control center at the Jet Propulsion Laboratory, a joint project of NASA and Caltech near Pasadena, California.