Flying time between Chicago and Dubai?

A random search for flights from ORD to DXB shows: OPTION 1: 16hr 35min ORD - ZRH Swiss International Airlines Flt 009 Dep 07:15pm 01Aug,Sat

ZRH - DXB Swiss International Airlines Flt 242 Dep 12:45pm 02Aug,Sun Flight Duration: 14hr 50min; Layover Time: 1hr 45min; Total Trip Time: 16hr 35min

1-way Economy fare $578.oo + Taxes & Fees $207.02 = Total $785.02 OPTION 2: 15hr 50min ORD - FRA Lufthansa Flt 8835 Dep 10:00pm 01Aug,Sat

FRA - DXB Lufthansa Flt 8904 Dep 02:55pm 02Aug,Sun Flight Duration: 14hr 25min; Layover Time: 1hr 45min; Total Trip Time: 15hr 50min

1-way Economy fare $780.oo + Taxes & Fees $211.67 = Total $991.67 Fares may vary with departure days/dates/airlines.