ISA Rules
🏛️Official — ISA5.1 Heat Format
Verdict
Heat duration: Standard heats are 30 minutes. The Competition Director may shorten heats to 20 or 25 minutes or extend to 35 minutes based on wave frequency and conditions.; Surfers per heat: Early rounds may feature 3–4 surfers per heat. From the Round of 16 onward (and all Olympic rounds from R...
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