The statistics are synchronized at preconfigured intervals (the MCS interval) which are independent of interim-update intervals using the config>subscr-mgmt>acct-plcy>mcs-interval minutes | use-update-interval command. The MCS minutes interval value can also be the same as the interim-update-interval use-update-interval.
If there are multiple RADIUS accounting policies in a subscriber profile, the minimum value of all the configured MCS intervals in these RADIUS accounting policies is used for usage counter synchronization.