There is NO RULE about how many times you can "run it". I suppose you can run it until you run out of cards. These are one of the things that should be determined by your "House rules". Personally, I wouldn't allow it at all. My house is in business to make money, all these nonsensical aberrations to the game do absolutely NOTHING to add to the house profit and therefore I would not allow them to continue. House profit depends on the number of hands per hour and if you allow this stuff, I submit your hands per hour (and therefore your profit) will drop considerably.
Whether to run the board, turn/river or just the river more than once is something the players involved in the hand at the time this issue comes up have to decide between themselves. If the house allows this foolishness, the dealers ONLY responsibility is to ensure the house rules are followed. If the players cannot agree, then my decision would be that the will only be one flop, turn and river.
My suggestions would be to concentrate on the game as it is generally considered normal. These aberrations are nice to know about, but your learning time is better spent getting a copy of Robert's Rules of Poker or some other generally accepted text and learning that forward and backward, at least that is how I see it.