Your first goal with each post from your business Facebook page is to be seen by fans. But every post has a limited lifespan.
During that time, your fans see the post in their news feed and may like or comment.
But after a certain point, Facebook stops showing the post in their news feed.
If you knew the average lifespan of your posts, you could post again right when the previous posts died off. Your page would always have a live post out there for fans. You’d be maximizing your possible exposure.