Hi Kevin,
Thanks for the quick answer.
Interestingly enough Handbrake also displays the file length at 27:22. It seems that this isn't Adobe specific anymore but rather a general problem with the source file.
Although this is the first time it happened, and I have used the exact same settings for months now.
Germata
EDIT: I changed the setting of Dxtory to a differenct Codec. Now all programms recognize the actual length. It appears to be a problem with the Lagarith Codec.