That depends on how often you're using your scissors, clippers etc., but you'll notice that they won't cut as well once they start getting dull. I wouldn't wait that long though, so if you can have two sets of your tools to rotate then you can always ensure one set stays sharp. That way you can drop off your dull set at one of our 2 dropbox locations in Edmonton and we'll have them ready to be shipped between 3-5 business days.