2 Hours and 6 Minutes.
11hr 50min Chicago OHare (ORD) to Amman (AMM) by a nonstop flight operated by Royal Jordanian.
14hr 10min Chicago OHare (ORD) to Seoul Incheon (ICN) by a nonstop flight operated by Korean Air.
O'Hare's longest runway is 13,000 feet.
5 Hours
Assuming that you mean LaGuardia Airport in Queens, New York and not LaGuardia, Spain, it takes one hour and nine minutes to drive to Newark, New Jersey.
You have to audition for LaGuardia to get on to it.
The distance between the start point and the destination is 334 miles, and will take approximately 5 hours 18 minutes of driving time.
It could take anywhere from 4.5 to 6 hours, depending on air currents and air traffic patturns.
Even in good traffic conditions this can take 30 minutes. At peak times this can take well over an hour.
JFK or LaGuardia
A flight leaving Chicago OHare on United going to Addis Abbaba takes over 37 hours, passing through Frankfurt, Germany, Khartum, and Sudan. If your flight left on a Wednesday night, for example, you would be on the ground in Ethipoia a little earlier on Friday evening Ethipia time.