preferredMaintenanceWindow

The start time for a one-hour period each week during which OpsWorks CM performs maintenance on the instance. Valid values must be specified in the following format: DDD:HH:MM. MM must be specified as 00. The specified time is in coordinated universal time (UTC). The default value is a random one-hour period on Tuesday, Wednesday, or Friday. See TimeWindowDefinition for more information.

Example:Mon:08:00, which represents a start time of every Monday at 08:00 UTC. (8:00 a.m.)