The period after which to deprecate the cross-Region AMI copies. The period must be less than or equal to the cross-Region AMI copy retention period, and it can't be greater than 10 years. This is equivalent to 120 months, 520 weeks, or 3650 days.
The unit of time in which to measure the Interval. For example, to deprecate a cross-Region AMI copy after 3 months, specify Interval=3 and IntervalUnit=MONTHS.