Pumping at work

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FTM here wondering how frequently do you pump at work and how long does each pumping session last? Do you wash out all your pump parts as well and if so how long does this take you in addition to the pumping session? I am in Oregon and by law they are required to allow you to take as many pump breaks as you need. I am trying to get an idea when I go back to work what the day will be like. I also am working at a preschool and debating if I want my own classroom or a "floater schedule" which would be giving mostly breaks and lunches but a lot more flexibility regarding how often I can leave the rooms to pump.