well it all depends on its flight hours and how well it is maintained , a plane does have its limmits though if you take usaf kc135 tankers they are being constantly upgraded when they were early 707's they have new engines and a truck full of big upgrades i hope my awnser helps you a bit cheers =D
Aproximately 9 hours by plane
About 2 hours if you fly directly.
6 hours
If you fly from the U.S. to The Philippines, it is hard to find a flight that does not make a stop in Japan, but either way, you'll be on a plane for about 22 hours altogether.
Depending what plane you fly on and if it is nonstop flight.
It will take maximum 2 hours.
If you fly direct it will take approximately 17 hours.
About two hours non stop
It will take 21 hours
About 16-18 hours if taking into consideration a stop and change of plane at another airport (about 14 hours net flying time).
10 Hours plus stop
The time of flight to fly from Italy to Dominican is about 15 hour if the plane is flying at 400km/h. It all depends on the speed of the plane.