At our bi-monthly tournament we currently play the following mode:

Main round: We play from 11 am to 7 pm in (strict) Swiss system head-to-head (approx. 21 games) (incl. 1h lunch break).
Quarter-finals: The best 8 players of the main round qualify (play-off in case of a tie) and play a best-of-5 head-to-head (1 vs 8, 2 vs 7, 3 vs 6, 4 vs 5).
Semi-finals: The winners of the quarter-finals play a best-of-5 head-to-head.
Final: The winners of the semi-finals play a best-of-5 head-to-head.

The losers of the quarter-finals will play a best-of-four match for 5th to 8th place.
The losers of the semi-finals play a best-of-3 head-to-head for 3rd and 4th place.