"load-interval" for "bps" and "pps" values in "show interfaces" output

Cisco IOS devices are able to show 30s average("load-interval 30") for ingress and egress traffic on a switch/router port("bits/sec" and "packets/sec" values in "sh interfaces" output). What is the "load interval" for Juniper M and MX series devices? I mean if I do for example "show interfaces ae0.11", then what is the "load-interval" for values in "bps" and "pps" columns?