How many minutes must pass after the last lightning strike before resuming activity?

The standard guideline for resuming activity after a lightning storm is to wait at least 30 minutes after the last visible lightning strike or the last sound of thunder. This rule is based on the understanding that lightning can strike with little warning, and the risk remains until the area has been clear for at least that 30-minute period. This precaution helps ensure the safety of participants, as the threat of lightning continues even after a storm appears to have passed. Observationally, weather patterns can change rapidly, and waiting this duration provides an additional safety margin before returning to outdoor activities.