I've never had this issue with a video file before... I have a video that's ~54 minutes long. When I import it into Premiere, only ~20 minutes of the video comes through. I've included screenshots of the full video opened in Quicktime (just to see that it is, indeed, 54ish minutes) and then a screenshot of after it's been dragged into Premiere and cut off. Anyone know how to fix this?
I see Media Browser open. Is that how you imported it into Premiere? (That would have been one of my suggestions.)
It doesn't look like spanned media, which would come in chunks like that, and Media Browser is able to read the metadata and folder structure for those types of files to import them properly. In this case it might just read the metadata better.
You might also try remuxing this file with something like Shutter Encoder just to see if that will help it to be read properly.