Every tenured professor is expected to have at very least one PhD student. A PhD takes on average less than 8 years and a tenure more than 20. Though I think a

Every tenured professor is expected to have at very least one PhD student. A PhD takes on average less than 8 years and a tenure more than 20. Though I think a more reasonable replacement rate is 10+ PhD graduates per professor. I do not think this problematic somehow, unlike what overproduction implies.