This report gives you Average Transmit & Receive, Peak Transmit & Receive, Transmit & Receive % Utilization and finally total Circuit % Utilization of Transmit & Receive for WAN Interfaces on routers. It only reports on usage during the working hours of 8a-6p M-F for the past 30 days.
As with our other reports, this uses a custom property field for location. It groups nodes by location.
There are a few filters that won't apply to other networks, so edit accordingly.

EDIT: Updated report and works with 10.6.1. MPLS or other Interface Stats - Working Hours - Last 30 Days.OrionReport