How do i shorten the Average IN and Average OUT

Pretty good plugin, i had to delete the line :
#$output .= “Total RX: “.$rx.$label.”, Total TX: “.$tx.$label;

Because i use this with nagiosgraph, i couldnt see any of the Average’s only the Totals which were >50gb

Question: how do you lower the average time for Average IN and Average OUT? i would like to know if our bandwidth every maxes out over, say 5 minutes.