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.
5 Hours
O'Hare's longest runway is 13,000 feet.
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.
It could take anywhere from 4.5 to 6 hours, depending on air currents and air traffic patturns.
The distance between the start point and the destination is 334 miles, and will take approximately 5 hours 18 minutes of driving time.
Even in good traffic conditions this can take 30 minutes. At peak times this can take well over an hour.
JFK or LaGuardia
No, you cannot take a direct train from LaGuardia Airport to Danbury, CT. LaGuardia does not have a train station; you would need to take a bus or taxi to a nearby train station, such as Metro-North’s Grand Central Terminal in Manhattan. From there, you can catch a train to Danbury.