There are a few questions where an answer has been accepted really quickly. In at least one case, the question got an answer after 20 minutes and had an accepted answer less than 30 minutes from being asked.
I'm all in favour of accepting answers. (I've accepted an answer in 10 of the 11 I've asked and haven't yet got to trying the various answers on the 11th, but will accept one when I have.) But, such quick turnarounds from asked to accepted don't seem a good thing to me. It will surely result in better answers not being accepted. Yes, that's inevitable as part of the SE design, but very quick acceptances make it more likely. They also may reduce the likelihood of a better answer being offered. Some may not bother to answer if the "prize" is already gone. Others, viewing the questions, might think that if an answer has been accepted, then the question has been dealt with and never get as far as seeing that the better answer in their head hasn't made it on to the site.