A pizza is put in an oven with a constant temperature of 230 degree Celsius. The initial temperature of the pizza was 15 degree and one hour later, it became 65 degree. How long will it take for the pizza's temperature to become 80 degree? (Feel free to use the solution we obtained for Newton's law of cooling. Notice that in this problem we are heating an object. The only difference is the constant k being positive)

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