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Rating Newest Oldest. Best Answer: The symptoms of lactose intolerance can manifest anywhere from 30 minutes to 2 hours after ingestion of lactose containing food. The symptoms can last up to 3 days following ingestion. Although the severity of symptoms vary with each individual, here are the most common reactions: -Abdominal discomfort.
However, it only takes 10 to 15 minutes for the urushiol to penetrate the skin and bond with cell membranes. Some people experience symptoms after as little as 30 minutes. Others may not have symptoms until 14 days following exposure. In typical cases, the reaction is most severe five days after the exposure. Mild cases of poison oak last from five to 12 days. Severe cases may last up to three weeks or longer. The rash often appears streaked and may develop into oozing blisters.