Evidence of Health Risks Associated with Prolonged Standing at Work and Intervention Effectiveness
(www.ncbi.nlm.nih.gov)https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4591921/Basically if you care about circulation you don't want to sit or stand for longer than an hour without doing a little bit of the opposite for a couple of minutes.
Percentage of workers who actually do that in either direction, very few. And they go home feeling like shit for it in both cases.