No matter how long it takes to get there, the difference is 14 hours. Think about it - if you have 2 places in the same time zone & it takes 2 hours to drive from 1 to the other, there isn't suddenly a 2-hour time difference between them.

But here's a little something for you to think about. If 2 people set off on the same journey, 1 on foot, the other on a very fast motorcycle and they both follow exactly the same route, by the time they arrive 1 will have travelled further than the other due to relativistic effects. At mundane, Earthly speeds the difference is negligible but it's real. That means the Earth is a different size depending how fast you travel.

There's the adage about the world shrinking. Well, with transport getting faster & faster, it really is. I'm sure 1 of our resident physics whizzos can tell you all about this this but, in the meantime, have a look at

http://www.fourmilab.ch/cship/lorentz.html where this phenomenon is explained in greater detail with some animations.