According to the breastfeeding guidelines of New Zealand and other international organisations, breast milk can only be safely kept at room temperature for up to four hours maximum. We recommend that you wear your Milk Collector for no longer than 4 hours at once, to ensure that the milk you collect does not become unsafe. If you need to wear your Ladybug for longer stretches of time, you can simply empty your milk into a safe storage container after 2-3 hours of wear and store away in the fridge or freezer. Then wash your collector with warm soapy water, dry thoroughly and wear again. Repeat periodically as needed.