How much time would it take Mars to cool enough to be habitable by humans after a gigantic planetary impact?

Let's say humankind terraforms Mars aggressively, increasing the planet's mass (and gravity) to Earth-like levels and causes its core to produce a significant magnetosphere. For example, perhaps they could use Jupiter's moons (from the smallest to the largest) and even Mercury, and crash them in a manner that wouldn't split apart the planet. Disregarding the feasibility of this endeavour, how much time would Mars take to cool down enough to be habitable for humans?

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How much time would it take Mars to cool enough to be habitable by humans after a gigantic planetary impact?

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