90 min.
About four hours.
It depend on what time you leave at and where you live
Should arrive around 6PM-7PM.
Check on the web.
the flight would probably take about four and a half hours so you would arrive in Dallas at 7:45pm dallas time
Your question makes no sense.
Ask 542542 from your cellphone.
2:50 pm local time
Flight time (or length) will not be affected by time zones. The time that you arrive will be, however. It still takes a certain number of hours to get to a certain location, and time zones only affect what time it will be when you arrive, not the length of the trip. If you are implying what time it will be when you do arrive, it depends on which direction you are going. If you are going west, subtract an hour per time zone. If you are going east, add an hour per time zone.
If the flight was non-stop you would arrive 12hours 55min later. The time in Tokyo would be 11:55am the next day.
Arrives in Heathrow so look at http://www.heathrowairport.com/