AWS SDK for .NET Documentation
PreferredMaintenanceWindow Property
AmazonAmazon.RDS.ModelModifyDBInstanceRequestPreferredMaintenanceWindow Did this page help you?   Yes   No    Tell us about it...
The weekly time range (in UTC) during which system maintenance can occur, which may result in an outage. Changing this parameter does not result in an outage, except in the following situation, and the change is asynchronously applied as soon as possible. If there are pending actions that cause a reboot, and the maintenance window is changed to include the current time, then changing this parameter will cause a reboot of the DB instance. If moving this window to the current time, there must be at least 30 minutes between the current time and end of the window to ensure pending changes are applied. Default: Uses existing setting Format: ddd:hh24:mi-ddd:hh24:mi Valid Days: Mon | Tue | Wed | Thu | Fri | Sat | Sun Constraints: Must be at least 30 minutes
Declaration Syntax
public string PreferredMaintenanceWindow { get; set; }

Assembly: AWSSDK (Module: AWSSDK) Version: (