Well I did one time lapse that took me over 15 hours to film since I had to watch the milk and coke transform over night. I had to block our dining room so my girlfriend wouldn't accidentally turn off our lights by accident. That is one of the more awkward things I've filmed since being on YouTube. She wasn't around when I did my twerking panda riding a Roomba video. As far as editing I think I spent a few hours on my Ski video and it took 4 days to film, I'd say that's the longest I've had to edit a video since I sat through 4 days of footage to find the good parts.What is the longest you have spent on one project?