The weekly time range (in UTC) during which system maintenance can occur. Format: ddd:hh24:mi-ddd:hh24:mi Default: A 30-minute window
            selected at random from an 8-hour block of time per region, occurring on a random day of the week. To see the time blocks available, see  Adjusting the Preferred Maintenance
            Window in the Amazon RDS User Guide. Valid Days: Mon, Tue, Wed, Thu, Fri, Sat, Sun Constraints: Minimum 30-minute window.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public string PreferredMaintenanceWindow { get; set; }