Back to work pumping as a teacher

I’m not exclusively pumping but I will be pumping when I return to work and figured this sub would have the most experience with back to work pumping. Are any of you teachers? And if so, what did back to work pumping end up looking like for you? Did someone cover your classes, were you asked to fit it around your classes? Just wondering what it was like for you. I live in the USA so I know I get protected time I just don’t know how often or much I can expect.