there are missions put in, it's basically every time there's a chance to fire your weapon, your there
Sooo, basically you are talking about making a mission, with lots of cutscenes, right?
Anyway, there is no way I'd watch more than about 10-15 minutes of an OFP movie, unless it was DAMN creative, well-acted and well-done. We have all seen cutscenes, intros and outros, and unless you work VERY hard at making something completely unlike what we have all seen a million times, it would just get old after about ten minutes. I have yet to see a cutscene in OFP that didn't get tiresome about halfway through.
However, if you got VERY creative with things like music, cutrsc, fades, zooms, sound and anything else at your disposal, I would watch it for longer than 10 mins.