Away from Baby for the day & milk supply

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Has anyone been out somewhere without baby and couldn’t pump? At most I’ll be out for 8 hours. I bought a manual one that I could express myself in bathroom or something to ease my breasts sine I know they will get engorged. Has anyone else had to experience this yet? Any tips? One day won’t affect my milk supply right? Just looking for anyone that can relate & is helpful and/or knowledgeable! Thank you