Rated for a minimum of five minutes. That is actual tool time on the safe. If the UL technician stops to use the bathroom or get a drink of water the clock stops. Same once five minutes is reached.
Fort Knox will also add internal reinforcements of carbon steel, stainless steel or AR500. Any of these should make the safe that much more protected during an actual attack. In theory it should take twice the time to cut through two layers of 10g vs one layer of 7g. Stainless will help with torch attacks and AR500 should help protect against cutting wheels and grinders.
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