I think it’s amazing the speed an answer is given for any asked question, like freaking fast. If you are using Google Reader to peek new questions filtered by tag, when you see a question, almost for sure it’s already answered.
Fortunately all StackExchange data is open, so we can see exactly how fast is that. I used the online data browser, more than enough for the task.
I decided to consider only the questions having an accepted answer, since questions with many bogus answers should not be treated as having an answer at all.