How long does one 15 ml bottle typically last with daily use, and how should I store it?

Usage varies per person, but a standard guideline for an eye product is about 0.25-0.5 ml per application (a few rolls around each eye). At twice-daily use (morning and evening), a 15 ml bottle would last approximately 30 to 60 days. With once-daily use, it could last around 2-3 months. The roll-on applicator helps control the amount dispensed, minimizing waste. For storage, keep the bottle in a cool, dry place away from direct sunlight (like a bathroom cabinet, not on a sunny windowsill). The metal ball applicator can feel cool, but the product itself should not be refrigerated unless specified, as extreme temperature changes are generally not advised for cosmetic formulas. Ensure the cap is on tightly to prevent the formula from drying out or contamination.