Nope, do it this way. the cure time starts when the part has reached that temperature. It may take 30 mins to reach the temp, depending on the size of the part or density. You should get a IR thermometer and this way you can check the part temperature itself. You may need the part in the oven for 45 mins just to get a cure temp of 380 degrees for 10 mins. Heat up depends alot on the amount of "power" your oven has to emit BTU's into the oven chamber itself. Powder flow out, is kind of a erratic guess, and I would not do it that way.
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