How long does it take to fly from denver co to Athens Greece?

A random search for flights from Denver (DEN) to Athens (ATH) shows:

OPTION 1: 14hr 41min via Frankfurt (FRA)

DEN - FRA Lufthansa Flt 447 Dep 05:59pm 18Jun,Fri

FRA - ATH Lufthansa Flt 3382 Dep 02:00pm 19Jun,Sat

Flight Duration: 12hr 26min Layover Time: 2hr 15min; Total Trip Time: 14hr 41min