It’s in the neighborhood of $100,000, according to Hofstra University School of Law professor Richard Neumann. His estimate factors in the salary and benefits for a tenured professor at a high-paying school who spends between 30% and 50% of his or her time on scholarship and publishes one article per year.

It also takes into account possible research grants, which many schools offer professors to help fund their scholarly work, and the costs for research assistants.