A 12 team round robin runs 11 rounds with 6 matches per round and 66 matches in total — every team plays every other team exactly once. With an even number of teams nobody sits out, so all 6 matches run at once if you have the courts.
Round 1: Team 1 vs Team 12, Team 2 vs Team 11, Team 3 vs Team 10, Team 4 vs Team 9, Team 5 vs Team 8, Team 6 vs Team 7
Round 2: Team 1 vs Team 11, Team 12 vs Team 10, Team 2 vs Team 9, Team 3 vs Team 8, Team 4 vs Team 7, Team 5 vs Team 6
Round 3: Team 1 vs Team 10, Team 11 vs Team 9, Team 12 vs Team 8, Team 2 vs Team 7, Team 3 vs Team 6, Team 4 vs Team 5
Round 4: Team 1 vs Team 9, Team 10 vs Team 8, Team 11 vs Team 7, Team 12 vs Team 6, Team 2 vs Team 5, Team 3 vs Team 4
Round 5: Team 1 vs Team 8, Team 9 vs Team 7, Team 10 vs Team 6, Team 11 vs Team 5, Team 12 vs Team 4, Team 2 vs Team 3
Round 6: Team 1 vs Team 7, Team 8 vs Team 6, Team 9 vs Team 5, Team 10 vs Team 4, Team 11 vs Team 3, Team 12 vs Team 2
Round 7: Team 1 vs Team 6, Team 7 vs Team 5, Team 8 vs Team 4, Team 9 vs Team 3, Team 10 vs Team 2, Team 11 vs Team 12
Round 8: Team 1 vs Team 5, Team 6 vs Team 4, Team 7 vs Team 3, Team 8 vs Team 2, Team 9 vs Team 12, Team 10 vs Team 11
Round 9: Team 1 vs Team 4, Team 5 vs Team 3, Team 6 vs Team 2, Team 7 vs Team 12, Team 8 vs Team 11, Team 9 vs Team 10
Round 10: Team 1 vs Team 3, Team 4 vs Team 2, Team 5 vs Team 12, Team 6 vs Team 11, Team 7 vs Team 10, Team 8 vs Team 9
Round 11: Team 1 vs Team 2, Team 3 vs Team 12, Team 4 vs Team 11, Team 5 vs Team 10, Team 6 vs Team 9, Team 7 vs Team 8
The circle method pairs the 12 entrants across two rows, then holds one fixed and rotates the rest one position per round. After 11 rotations every pairing has happened once, which is why the total is 66 matches (12 × 11 ÷ 2).
At about 15 minutes per game to 11 points, 11 rounds take roughly 165 minutes, provided all 6 matches of a round run at once. With half the courts, double the estimate.
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