I find questions that are accepted less that one hour after. I think that the OP shouldn't be able to accept an answer before two days, let other propose alternative answers, detect hidden mistakes, ...
What do you think? Am I missing the spirit of SO?
Thanks to some comments I have found this link very interesting.
Compare the charts Time of first answer and time to accepted answer. A chart of the difference will be really interesting and will show clearly that people don't wait to compare between different answers.