I have a few screens that have been through production a few hundred times. If the tension is up to my standards then they stay in the rota. Really hard to say how many impressions are on them and my attempts at keeping a log/inventory concerning how many times a specific screen is being used have fallen short. With shopworks I think I can barcode each screen and it has a lot of functions that you can use with the barcode system but someone would have to get involved that I don't want in my business when it comes to shopworks functions.