How often to pump

Tyffany • Mom, wife & nurse...pregnant with baby #2!!
I haven't had my baby yet, but I want to make sure I have everything planned, in my head at least 😀. How often did you pump to keep your supply up?  A list of times would help me picture it better.  Thank you.  I will be going back to work 8 weeks after baby and am gone 6am-4pm.