What is the default time limit for a round in a Swiss-style tournament?

In a Swiss-style tournament, the default time limit for each round is 50 minutes. This duration is established to ensure that players have sufficient time to complete their matches while maintaining a reasonable pace for the event. Swiss formats typically involve a set number of rounds, with each round providing an opportunity for players to compete against others with similar records. The 50-minute limit balances the need for a competitive match environment while accommodating the complexities of gameplay that may arise during matches.

Other time limits mentioned in the choices are either shorter or longer than what is standard for Swiss-style tournaments, which could lead to issues such as insufficient time for players to complete their matches or excessive delays in the event schedule. Thus, 50 minutes is the optimal choice that aligns with the guidelines set forth in the tournament rules.