Can lactose intolerance symptoms always occur between 30 minutes and 2 hours?

Lactose intolerance. Typically within 30-120 minutes after ingestion but symptoms can persist or recur within any time frame, up to 24 hours, after ingestion.
No. The primary symptoms of lactose intolerance are boosting, nausea, gas, loose stools and cramping. These symptoms can persist for hours to days after lactose consumption.