I recently edited and released a short film from footage shot 3 years ago. My intention in shooting was to get some experience using editing software. On my previous shorts I had always sat with my editor on all sessions but never hands-on with the software. I shot the film without a script, intending to find a story as we shot or in editing. I discovered a story with the other actors as we progressed through the day's shoot. Three years later, the story altered somewhat in the editing.
Three years later wasn't my intention but in a way it worked out for the best. I was three years wiser with more experience in filmmaking. It had been a year since I had released a film so to have something new to release even though the footage was three years old was a blessing.
As for the editing, it took me some months but not as long as I thought. I began with one program, Lightworks, but it wasn't working out so I broke up that relationship and went onto another program, Videopad. I wasn't sure how long it would take me to edit so I didn't use Premiere. I didn't want to have money dictating as is, usually, the case.
I'm happy with the film, I didn't go my usual route by submitting to festivals, I just uploaded it publicly to YouTube and Vimeo. So, I highly recommend digging up any old footage, editing it and putting it out there.