The album was already just about 43 minutes long at the beginning of November and wasn't edited afterwards. Unfortunately, iTunes displays incorrect track lengths, making it look like the album is over 80 minutes long. The above filmmusicreporter.com link also states the correct shorter running times.
Oh you are right! I actually havent listened to it all yet, but just skimmed through some it and there was music playing all along where ever I jumped to in the track. But I see now when adding a 9 minute track into Audacity that its actually just 4 minutes etc. Thats weird of itunes!
From what I have found out from friends and other collectors, the full score with the complete End Credits comes to 19 cues (47:51). The restored End Credits runs about 6:09. That 83-minute length is a mistake.