The ATP need to sit down with Rafa and Nole and tell them it's not on.
Bad for tennis IMO.
I agree with you that it's bad for tennis, but I don't agree that officials should be sitting down with Nadal to explain it's not on. He is fully aware of both the rules and what he is doing. As PMK says, umpires should be enforcing the rules. If he is routinely exceeding the time limit, as he is, and by a considerable amount, he should be penalized. So that the player can be certain of how much time he has, large clocks counting down to zero could be installed at each end of the court, rather like in American Football.