Sales Order pegged to On-Hand is still showing in the Plan Output

Sales order pegged to Onhand Qty is still showing in the Planner workbench of the plan output. What is the criteria or until which state does the sales order remains or shows in the PWB.

Ex: Say On 25th Oct Plan output, the Sales Order A has SSD of 24th Oct and its pegged with On hand, but still showing in workbench.  Until which states does the Sales order is shown in the pwb.