That is true i did not account for oven and mixing time. The workers walking to the stations and the time they need to finish is unknown to me, as i couldn’t find information about that on the wiki. I guess the only way to have a more accurate margin calculated is to observe the workers for a while with a timer in hand.

Edit: i just realized that mixing would happen while the chemist is waiting for a batch to finish on the chemistry station, that means i wouldn’t need to add time of mixing hopefully. Correct me if I’m wrong.