I captured DV clips from tape into iMovie, with a new clip for every start/stop. When I import the files (from Finder) into Premiere every clip is max 9,24 sec, even thought they are longer. Same thing when trying to import into Resolve or transcoding with EditReady. Max 10 sec.
I vaguely remember my old workflow now, but in those days I was using FCP 7…I seem to recall that when capturing DV clips, that I had to run them through a third party program called “ClipWrap” which converted the files into something FCP could handle.
If it’s still available, maybe you can download a trial.