preferredMaintenanceWindow
Specifies the weekly time range during which maintenance on the cluster is performed. It is specified as a range in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute period.
Valid values for ddd
are:
sun
mon
tue
wed
thu
fri
sat
Example: sun:23:00-mon:01:30