What's the rationale for not letting me accept my own answer for 2 days?

Question

About one hour after asking a question, I found the answer on my own. I therefore wrote an answer to my own question, documenting the process. However, when I wanted to accept my own answer, I was greeted with a error saying there is a two days cooldown period during which I can't accept my own answer.

Now, if that's the rule, I'm fine with it (except that I risk to forget it, but that's my problem) but I was wondering what was the rational behind this. Is it to prevent self-promotion spam or something like this ?

Answer 1

There's a Meta.StackOverflow question about rate-limitations, which also links to this MSO question on accepting an answer which explains it's pretty much to give other users chance to post an answer - if you see a question with the green tick of acceptance it's less likely that they'll post another answer.