The Ryder Cup consists of 28 matches played over three days, and each match is played over a maximum of 18 holes. The matches include foursomes and fourball matches on Friday and Saturday, and singles matches on Sunday. Therefore, each individual match is up to 18 holes, but not all matches go the full 18 holes if one team wins earlier in match play format. In summary:

• There are 28 matches total.
• Each match is played over up to 18 holes.
• The total potential maximum holes played across all matches would be 28 matches × 18 holes = 504 holes.
• However, matches can end before 18 holes if a team secures victory early in match play.

So, the Ryder Cup event features up to 28 matches of 18 holes each, totaling a maximum of 504 holes played, though the actual number may be fewer due to match play endings before 18 holes.