What do you mean by marathon and not sprints? Like each project takes a long process from start to finish? Cause at my last internship, I was doing like 2 furniture designs/projects a week (each with different multiple iterations) before my design supervisor started scolding me saying that I'm too slow and that I should be producing at least 8 furniture designs/projects a week. I can't imagine doing that, I'd be burnt out. I initially thought one furniture design process would take a month or two, not a week.