Special:Badtitle/NS90:Talk:Enforced Method Acting/Long term

From the lead section: "Enforced Method Acting does not mean long term method acting the director forces the actors to do."

Then in what trope would this fit?

Film
 * In "7 Movies That Put Insane Work Into Details You Didn't Notice", J.F. Sargent reports that Das Boot director Wolfgang Petersen sequestered the cast on a set without sunlight for a year.