We typically use EV Hold tasks to keep emails on hold and prevent deletion. In DA we would set this up to occur every 12 months as we have a 15 month retention policy. In clearwell our only option is daily or weekly. This seems to add a lot of extra processing due to multiple hold tasks running every week instead of once a year. This also limits the number of hold tasks you can run per day because of the number of search threads and the time to complete a hold task.
Please add in the ability to do monthly or yearly schedules.