Does standing/walking for 5-10 hours a day count as cardio?

Hi! I work retail, so most of my days are spent standing behind the counter and then walking around the store when there’s no customers. My shifts are anywhere between 5 and 10 hours. Does that count as cardio?

I’ve been beating myself up for skipping the gym since a lot of my shifts have been on the longer time and my legs are hurting by the time I clock out.