I understand there is a policy of how long before an answer can be accepted.
I would like to know when exactly this policy was put into place? And does this rule vary depending on the op's reputation ?
I will explain a bit to give a purpose of the question. The intent of putting the 15 minutes rule is to avoid discouraging others to contribute. I did a very crude test of the effect of the rule. I plotted the distribution of how many answers each question get in the month before and after the 2010/03/27. The distribution barely changed. To say the least, my method did not show the 15 min rule did not have a significant impact on people's willingness to contribute. I am willing to do more tests of the rule. Perhaps you could suggest some. I think this question is still within the spirit of the meta site. I am trying to help the site understand its rule.