Average age of worklist in Days

Hello,

With refresh of worklist happening everyday, the count of UDM_WL_ITEM is getting increasing. Program UDM_REORG_WORKLIST takes care of deleting the data older than "X" days you put in that program and will delete the older items from table.

I need to know what is the average days one should put in this program. Anything SAP recommends or any other input from the members would be helpful.

Thanks

JE