The Moon makes a complete cycle through the twelve signs every 28.5 days and spends approximately 2.5 days in each sign. Every few days there is something called a Void-of-Course Moon that happens (today we have one from 4:56pm-8:14pm EST). A Void Moon lasts anywhere from a few minutes to several hours. It is a great time to go inward or do routine things, as opposed to initiating new projects or meeting new people.
Excellent article about the Void-of-Course Moon