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How often you need to wash your nappies depends on how many nappies you have in your stash. When I started washing my cloth nappies, nearly 12 years ago, I had twenty cotton nappies in my rotation and they took nearly two days to dry. So I had to wash every two and half days. But now my nuababy nappies dry in a matter of hours and certainly by overnight. The soaker pads are dry so quickly when I hang them on my Ikea washing octopus.