iOS release timeline

What is a standard waiting time between Apple accepting the app for distribution and then actually releasing it? I ask, because I have heard that if you want Apple a chance to feature your game you need to give them 6 to 8 weeks heads up before release, however, once Apple accepts an app for distribution they start notifying you after a month if you haven't released it yet. Can anyone provide some insight or share their experiences? I am very curious how all that works. I don't think releasing immediately after acceptance by Apple makes much sense either (wouldn't be enough time for reviewers for the pre-release). Thanks to all who respond