How do we calculate pumping intervals? Frm start or end of pump?

Calculate from the start - I also had this question last time. But the X hrly that u are pumping at can only be more accurate that way as there will be times when u pump more or pump less or hand express some etc. so a clearer guide and easier to count will be at the start

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From the start of the pump. So assuming you are planning to pump 3hrly and you start pumping at 1pm, then your next pump session will be at 4pm regardless of how long you pump.

Start of your pump