I am curious how long does it really take many of you to edit and produce a clip from your long trips? How many hrs over what time span????
I use two approaches.
One, which I prefer, is the storyline approach. Either formed before or during the trip, i put together a story, figure out the rough narration then skim through the footage to find stuff that matches the narration. Some good footage gets wasted but I usually find a way to weave in the really good stuff. I find people react best to these "built-up around a story line" edits. You'll need b-roll footage to tell the story.
If you have lots of great footage, you might be able to do two or more stories.
The second method, is the multi-pass cutting approach. First pass cuts out the crap. Second pass gets rid of the "almost good enough". Third pass gets rid of the duplicates. Fourth pass trims down clip lengths to make it more punchy. And so on. Paring it down until only the very best is left. Then I set a target time and cut aggressively to that time.
With both approaches, you need to be brutal with yourself. The main challenge with being both the shooter and the editor is that, when you do the editing, you are seeing what you wanted the shot to be when you shot it, not what is really in the footage. I find that it helps to let some time pass before you do the editing. Maybe a month. Then you can be much more dispassionate and look at the footage as if you've never seen it before.
Hard to definitively answer the "How many hrs over what time span?" question. At least an hour per minute of final footage, maybe two. As I indicated above, after a trip, unless I have a client demanding quick results, I'll just upload the video to disk and then leave it a month before starting to edit. Some projects take a few weeks, doing an hour or two a day. Longest was 6 months.
But it is worth it. Shooting good footage is only a third of the videographers commitment to the art. Story-telling and editing are the other 2/3rds.