A 52-year-old man with a BMI of 34 kg/m² presents with excessive daytime sleepiness and witnessed apneas during sleep. Polysomnography is performed, and the EEG tracing shows the pattern marked **B** in the diagram — repetitive brief EEG frequency shifts occurring immediately after each cessation of airflow. According to AASM scoring criteria, what is the minimum duration required for each of these EEG events to be classified as a microarousal?
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