Terraformed Venus and Mars

A Traveler from a very advanced civilization has visited the Solar system. He found the humans likable, and decided to leave them a boon. For some reason, he couldn't do anything directly to the Earth or humans, but what he conducted was a compete atmospheric terraforming of Venus and Mars.

On day X, Venus and Mars' atmospheric composition and surface pressure has turned to be an exact match of the Earth's. Moreover, they got enough water vapor to form seas and even oceans. However, for the same unstated reasons, or completely other ones, the Traveler didn't do anything to the planets' interiors or even the minerals at the surface.

The question: for how long would Venus and Mars stay habitable after terraforming?

P.S. My definition of habitability is that some of the Earth animals and plants would be able to proliferate and humans can walk around without spacesuits (but some protective clothing is Ok).

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Terraformed Venus and Mars

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