Well, it depends greatly on the subject matter, but no, in my case, we're probably talking about a couple of hours, tops, to write. It's picking through the questions and finding ones to answer that tends to take some time. Some people go for whatever and offer three or four lines worth in reply. It's the more detailed responses that earn the rewards, though, so I'm not sure what people are doing. Questions that only require a few lines to answer I generally don't go for simply because they can be a waste of time. If I think someone is genuinely trying to ask a question because they want input, I might answer, but otherwise, I find ones I can sink my teeth into. :)