I've taken the MMPI twice ! One time was during my inpatient hospitalization and the other time was during my residential treatment stay. It was incredibly long and tedious- many repetitive questions. If I recall correctly there were between 500-600 questions. The first time I took it on paper with a Scantron and filling in all of those bubbles took me HOURS. The second time I took it on the computer, which was much more bearable. Nobody ever went over my results with me I'm curious now as to how the test turned out and what it would have said about my personality.
Sometimes they will charge you to have someone review the results with you.