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Nicklaus took a long time over the ball but said he tried to make up for it by being ready to play more quickly than average.
How much time are we talking about here? If I'm playing with a guy who stands over his shot 10 extra seconds, I can use the time to visualize my own shot. If he's taking two extra minutes per putt, that's another thing. You could get stale. Of course, on public courses, sometimes you're waiting a LONG time for the group in front of you, anyway.
On tour, do players ever have to wait for the group in front of them, by the way?