The Silver Storage strips help to protect silverware by removing anything in the immediate atmosphere that can cause the silver to tarnish, so the most important thing when using the strips is to ensure that the environment in which the silver is kept is as tightly closed as possible.
With this in mind, how many strips to use and the length of time they will last can depend on how open to the atmosphere the silver is, how often the drawers are opened and whether they are left open etc. As conditions can vary so much individuals will need to find out what works for them.
As a starter we would recommend for one large drawer to use 1 or 2 strips (i.e.3-6 tabs) replacing every 6 months. If this isn’t working as well as expected then you may need to increase the number of strips and/or replace more often.