9 hours and 10 minutes roughly
Well the shortest duration time from Tokyo (TYO) to Paris (PAR) is about 12 hours and 15 minutes but I don't know about Tokyo to Paris (ORY).
12 hours and 15 minutes
13hr 40min Taipei (TPE) to Paris (CDG) by a nonstop flight operated by EVA Air.
13 hours at its shortest it some time takes 18 when flight are delayed
7 hours
12 hours apart
There is a 7 hour time difference, with Tokyo being ahead, and a flight takes about 11 hours 30 minutes, so technically it is possible, depending on the actual departure time from Paris. If it was a very early flight from Paris, then it could be done. Actual departure times from Paris tend to be later, so generally the arrival in Tokyo is on the next calendar day.
Tokyo is 15 hours ahead of Iowa.
Paris to Rennes is about 4 hours.
About 7 or 6 hours
14 hours
The total flight duration from Paris to Nouakchott is 5 hours, 13 minutes