Answer to my own question requires at least two days to be accepted

Question

Why does accepting my own answer require at least two days before it can be done?

Answer 1

There are some special rules around owner-accepted answers, to prevent gaming:

1. Wait 48 hours. You must wait 2 days from the time you originally asked your question before you can accept your own answer. This gives other users a chance to answer the question in good faith, and earn the accepted answer.
2. No change in sort order. Normally, accepted answers are “docked” under the question. This is not true for owner accepted answers; they stay in standard sort order like any other answer.
3. No reputation is earned. Normally, accepted answers confer +15 rep to the answerer and +2 to the owner. Owner accepted answers do not earn rep (or badges) for anyone.

For more info check this Meta Post