The weekly time range (in UTC) during which automated cluster maintenance can occur.
Format: ddd:hh24:mi-ddd:hh24:mi Default: The value selected for the cluster from which the snapshot was
taken. For more information about the time blocks for each region, see Maintenance Windows (http://docs.aws.amazon.com/redshift/latest/mgmt/working-with-clusters.html#rs-maintenance-windows) in Amazon Redshift Cluster Management Guide.
Valid Days: Mon | Tue | Wed | Thu | Fri | Sat | Sun
Constraints: Minimum 30-minute window.