How long can lasagna be kept out after cooking and can is stay in a warm over for about 6 hours?

Cooked lasagna should not be left out at room temperature for more than 2 hours to prevent bacterial growth. Keeping it in a warm oven for about 6 hours is not recommended, as temperatures below 140°F can allow harmful bacteria to multiply. For food safety, it's best to refrigerate lasagna within 2 hours of cooking if not serving immediately.