How often should I reapply the lavender insect-repellent oil during outdoor activities?

The oil base helps slow down evaporation, but the protective aromatic layer can diminish over time. Reapplication is usually needed every 2–3 hours for consistent effect, especially in warm weather, during physical activity that causes sweating, or after contact with water, like washing hands or swimming. Since it's an oil-based product, it may feel slightly more persistent on dry skin compared to a water-based spray, but you should still reapply if you no longer notice the lavender scent on your skin. For extended outdoor stays, such as a full-day hike or an evening on the terrace, plan to carry the bottle with you. Always test your skin's tolerance first, and avoid applying too frequently if your skin is sensitive.