Airbus and Boeing flight times
Found this interesting, went through my log book and took all the flights that I have done on the 747 classic and later the A340 and looked at the average times on sectors that I have done in both aircraft. Some useless info but maybe it will help.
JNB-FRA B747-300 average times 10.3
A340-600 10.4
JNB-PER B747 8.8
A340-200 9.2
PER-JNB B747 10.5
A340-200 10.8
JNB-ZRH B747 9.9
A340-200 10.6
ZRH-JNB B747 10.3
A340-200 10.5
JNB-HKG B747 13
A340-600 13.2
I wasn't fortunate enough to fly the B747-400, I loved the classic but prefer the Airbus