Breast pumps & pumping schedule?

Am
I have a lot of anxiety about having to pump when I return to work. My office doesn't have a spare room for me to use. I'm pretty sure by law they have to provide a clean, private space that isn't a bathroom. This means I have to kick my boss out of his office each time. Since my company is only 5 people, and doesn't fall under the FMLA laws though, I'm not sure if the breast feeding law applies either. Thoughts?
Questions: best pump? I've heard the medala in style is good. 
How many times a day at work will I likely need? 
How long does the process take? 10 mins? Half hour??

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