In Windows Server 2008/2008R2 you can set task to repeat every number of hours you want, corresponding drop down menu just present you with 1 hour option to select, but you can type in any number of hours you need (see screenshot below).
In Windows Server 2008/2008R2 you can set task to repeat every number of hours you want, corresponding drop down menu just present you with 1 hour option to select, but you can type in any number of hours you need (see screenshot below).