How long for lobotomy school?

There is no such thing as "lobotomy school." Lobotomy is a now-obsolete and extremely controversial neurosurgical procedure. It was never taught in a formal school setting in the way that other medical specialties are. Doctors who performed lobotomies learned the technique through apprenticeships, observation, and limited formal training which varied greatly in quality and oversight. The procedure's ethical and medical flaws led to its widespread abandonment.