post more info.
What did the QT vid show in the 7minutes? the whole video sped up or only half?
were you working with multiple formats in the timeline?
are we talking premiere pro or elements?
what were your quicktime settings?
First guess would be to check your work area bar is covering the entire sequence you want rendered. Second double check your QT settings for anything suspicious. Maybe try to render out to one single .avi (since that’s premiere’s favored format), then render that file out to QT. I know there have been times that past versions of After Effects has had problems with certain versions of the QT player, so it doesn’t surprise me that premeire doesn’t like QT.
not sure this helps, but maybe it will get you started on the right track.
-Jeff
