I do record every PT and make a timing sheet each time like J.Y. does. (cf. J.Y.'s timing sheet of PT80; click "See timing sheet here.") You can see that he never spends more than 40-60 seconds on 1 or 2 star questions.
I thought the comparitive RC passage was killer. But I am looking at PT71 and PT 72 curve. This has not bearing on this test (between 71 and 72) but wow. LSAC was into hard tests in 2013-2014 apparently.