Assuming that the dried blueberries you have do not get too moist, you will be able to keep them as long as you want and still eat them. In theory you could keep your dried blueberries for a lifetime before you have to worry about them going bad.
You will also be able to freeze your blueberries to eat at a later date if you are not ready to eat them right away. One of the best things about all dry fruit, including these berries, is that they last forever as long as you store them properly. Just make sure to keep them in a place where they will not be exposed to a lot of moisture.