About:
Load data is gathered on every interface every 5 seconds, this data is used to calculate a weighted-average over time and then shown on the interface, the load-interval command sets the time that this average load data will be calculated over.
if the load-interval is set to 30 sec, the average load is calculated over a 30-second period. default is 300sec (5min), this can be very long if you are troubleshooting a link.