Mascara lasts two to three months.
Makeup shelf-life varies from product to product, but mascara can go bad in a few short months.
Generally, you should chuck mascara after two or three months, or when it becomes clumpy or develops a strange odor.
You should never add water or saliva to your mascara in an attempt to moisten it if it dries out, either, as this can introduce bacteria into the product, per the FDA.
