Questions: How long to heat up the refried beans (canned Rosarita beans with onion, garlic, peppers, tomatoes) and taco meat (already cooked and rinsed and I will add the seasonings) in the electric roasters? Will four hours be enough time? And the rice I will reheat in the full steamer pans in the oven, so how long for that too?

As always I thank you for your gracious help.