There's only one way to rehearse an orchestral piece, which is what I do. I take either a Mozart symphony or a Strauss tone poem. I play the whole thing through beginning to end without a stop. The whole blessed thing. The orchestra makes a few mistakes, naturally. I play through a second time. The orchestra makes no mistakes. I then just take a few little difficult parts. I pinpoint them, I emphasize them, I repeat those three or four times - I'm ready for performance.
What does the young conductor do, who will never profit by anybody else's experience, thanks to his unconquerable egotism and innate stupidity? He will take a first class orchestra, and after playing twenty bars he will stop, and he begins educating them - fancy educating a body of people like the Royal Philharmonic Orchestra! They already know the damn piece ten times better than he does. He gives us one more twenty bars, stops, starts educating, teaching them. That's why he wants six rehearsals, and that's why I can do with two!
The point of course is that we mainly get better in rehearsals by playing the piece, not by listening while we are told how we should have played the piece. It works at the amateur level as well, though there may be more in the way of errors that need to be cleaned up after the play-through. But even at an amateur level, people learn faster through actually being able to play the piece!