A long time
the flight time from Tokyo to dublin is 9 hours
About 2 hours
The flight time from Tokyo to Virginia is approximately 14 hours and 9 minutes. The exact travel time depends on factors such as weather conditions and delays.
As my calculations say, it would take you about 5 hours in a direct flight from Tokyo, Japan to Berlin Germany. Unless there's any delays, or changes in the flight. Then, this time might increase.
The travel time by train from Tokyo to Yokohama typically ranges from 25 to 40 minutes, depending on the train service you choose. The Tōkaidō Line and the Yokosuka Line offer frequent connections, with the Shinkansen taking the least time. Trains run regularly throughout the day, making it a convenient trip.
on a direct flght this would be 18 hours, check http://www.howmanyhours.com/fr/index.php
It may vary depending on Daylight Savings. You can always find out the current time in both places by going to http://what.timeisit.in/vegas and http://what.timeisit.in/tokyo
The best time of the year to go to Tokyo for sightseeing is in Spring and Autumn. In Spring and Autumn in Japan, the cherry blossom trees bloom and colors begin to show.
At this point in time, I could not find any direct flights into Tokyo. You may want to check with the airlines at a later date to see if they are going to provide direct flights into Tokyo.
Refer to this page here for various means of transportation and estimated time. http://wikitravel.org/en/Nagoya
8.5 hours
About 4 hours.