How long does the average waterproof mascara last?

The average waterproof mascara can last anywhere from 6 to 12 months, depending on usage and storage conditions. Factors such as exposure to air, humidity, and the frequency of use can influence its longevity. It's important to replace mascara after three months of opening for hygiene reasons, even if it still appears to be effective. Always check for changes in texture or smell, which can indicate it's time to discard it.