When you are looking at the sales order header there is a field called deadline that you might be able to use in your processes. This is setup from the accounts receivable parameter period of validity. Once set the deadline value will be populated and you can use this to search for orders that haven’t been processed by the dealine so you can decide if you follow them up or remove them.
Here is a quick overview
AX2012 R3 CU9
In the video I mentioned the mark order as void which you can get an overview in this post .