Tournament days are Thursday through Sunday. Practice/Pro-Am are held Monday, Tuesday and Wednesday. If there are weather delays a tournament can be extended into the following Monday's.
Since thus question seems to be in tension to Bethpage Black, do you mean the PGA Championship? In either event, the US Open or PGA Championship, the tournament structure is the same. There are 3 practice days Mon-Wed and 4 tournament days, Thurs-Sun. All men's professional golf tournaments are structured this way.
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