"In reality it would takes hours for it go all over Mars and for the sky to turn blue."
One little pyramid ejecting air from the top (which would be about the equivalent of a smoke stack on a big factory, or a few/several factories combined) to create an atmosphere around an entire planet? It wouldn't take hours, it would take millennia, assuming there weren't other problems, which there are.
You can't just pump oxygen into the Martian atmosphere and expect it to remain as pure oxygen. Oxygen is highly reactive; readily forming compounds (e.g., oxides) with nearly all other elements. That's why metals and other things oxidize (called "rust" when it happens to iron, AKA: iron oxide). You need something which constantly produces oxygen in order to counteract all the oxygen that is being effectively lost due to it forming compounds with other elements, and one little oxygen-producing reactor isn't going to cut it for an entire planet; not even close. On earth, plant-life produces oxygen as a byproduct of photosynthesis, with about half of it coming from plant life in our oceans, and the other half coming from trees, shrubs, grasses, etc., on land. Even with all of that oxygen production constantly going on all over Earth since ~forever, oxygen only accounts for ~21% of our atmosphere, with most of the remainder being nitrogen (which, unlike oxygen, is more or less inert).
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