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Yes, depending on the mixture, they can take anything from 15 minutes to 30 minutes. One good way to know if they are done is to check them evry 5-10 minutes. Don't open the oven door too much though...
No. But if you prefer or need to use a good cooking oil, always use olive oil, its healthier. Using no oil to cook meat will allow it to brown faster under a high heat. Many restaurants cook this way.
When meat is cooked the heat penetrates the raw meat and cooks it. The heat also kills bacteria including deadly salmonella. Never eat raw meat, EVER EVER EVER!