How long does tuna take to cook at 350?

approximately 25 to 45 minutes
Bake for approximately 25 to 45 minutes at 350 degrees F. Cooking time depends on the oven temperature, quantity and size of steaks.

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What temp should tuna steak be?

115 degrees Fahrenheit
Pat the tuna dry and sprinkle liberally with salt and pepper. Grill 30 to 60 seconds per side, until cooked on the outside but still raw on the inside. It’s helpful to use a food thermometer: the internal temperature should be 115 degrees Fahrenheit.