I've done an hour answer before, then gone to bed, then woken up and realized how much I had missed… Dropped in a second hour. Then, as comments/votes came in, realized it was stupid not to search out some decent pictures, which sometimes had great accompanying text…
Anyway, long story short, with all the little follow-on tweaks and embellishments, my answer to "What is it like to work as a "pusher" in Tokyo's subway system?" probably clocks in at around 5 total hours of thought/research/writing. Which is probably a sad statement about my "skillz".
What is the longest amount of time you've spent answering a question on Quora?