Automatic Extension Switching During Business Hours

How could I go about splitting the incoming calls from a certain extension to automatically switch over to a new extension after a certain amount of hours. We have two call shifts during the day: 8:30-1, and 1-4:30. Two separate people, with two separate extensions that we have to manually switch each time. Is there a way to do this automatically? I looked at the "User Hours" under Settings, does this affect a single user, if so, if I set one user to one shifts hours, and another person to the second shift, will the extension automatically switch?