Volumes two through four were released in one month intervals after that, with the last being released on October 24, 2007.

The first episode was released on January 28, 2011 with the following two episodes to be released in one month intervals.

Further volumes continue to appear at approximately six month intervals.

The extra three month interval often helps as the initial model or release is nearly always modified or upgraded by the following Spring.

- Subsequent recall testing to be run at six month intervals as required by your health needs.

If a prisoner's sentence is less than seven years, he must be reviewed no later than at 18 month intervals after the initial hearing.

If this sentence is seven years or more, he must be reviewed no later than at 24 month intervals following the initial hearing.

After 2005, Nano did not attend parliament regularly but only came in a 6 month interval to claim his monthly pay cheque.

Sessions are held twice every year between six month intervals.

A female caged with an impotent male produced clutches at roughly one month intervals.