That Duration is right at what would happen if one had a HDD formatted to FAT-32 and not NTSF. With FAT-32, there is an approximately 4GB limit. While DV-AVI is ~ 13 / hour. Either G-Spot, or MediaInfo will tell you the Duration of the file, plus everything that you could want to know.
Good luck, and please let us know a bit more,
TH HD is a NTFS-disk.
I don´t know what happened yesterday but now the the files can be imported without problems!
Hm-m, maybe they "heard" that you were tracking down solutions on how to Import and edit them, and they "came around."
Whatever happened, it sounds like you are up and editing.
If you experience any issues, please post the full details of those files.
One thing that can cause somewhat similar issues, is if one begins editing, while the Conforming and Indexing (MPEG files mainly), is still going on. Upon Import, let the Conforming complete 100%, before you do anything else. This ARTICLE goes into more detail.