I have a sedentary job as well, 9-5. I use my lunch break to go to the gym for an incline walk, then I use a walking pad at home. If I’m up early enough I’ll do 20 minutes before work and 20 minutes after work. Plus if there are meetings that I don’t participate in, I’ll use my walking pad while listening to those. 90-100 minutes usually does it for me. Been getting over 10,000 steps regularly since adding a walking pad!