How long is the flight from Boston to panama?

A random search for flights from London Heathrow (LHR) to Panama City (PTY) shows:

OPTION 1: 15hr 00min via Amsterdam (AMS)

LHR - AMS KLM Royal Dutch Airlines Flt 1000 Dep 06:35am 22Jan,Fri

AMS - PTY KLM Royal Dutch Airlines Flt 0757 Dep 11:10am 22Jan,Fri

Flight Duration: 12hr 55min; Layover Time: 2hr 05min; Total Trip Time: 15hr 00min

OPTION 2: 18hr 45min via Madrid Barajas (MAD) (Cheaper option)

LHR - MAD Iberia Flt 3161 Dep 07:25am 22Jan,Fri

MAD - PTY Iberia Flt 6347 Dep 12:05pm 22Jan,Fri

Flight Duration: 17hr 25min; Layover Time: 1hr 20min; Total Trip Time: 18hr 45min