If asked how long the hot phase of the invasion will last, I would always give two predictions. The first is by autumn. This is an optimistic forecast. The second is by New Year.
Putin is an idiot. For him, restoring the empire exactly 100 years after the creation of the Soviet Union is a matter of principle. He will keep on attacking until the end of the year.
But he is also a coward and a corrupt official. So Ukraine receiving Western weapons and support could deplete his army both materially and morally.
A second "Versailles" would be worst of all. After the First World War, the Germans felt humiliated, but not destroyed. That's why Hitler appeared.
We could say that Putin is Russia’s Hitler. But if we simply sign a peace deal that is unfavorable for us, then who is to say that another “rashist” Hitler wouldn’t emerge after this one?
Therefore, our goal is to destroy the Nazi dictatorial regime in Russia. And by “our”, I mean not only that of Ukraine, but of the entire democratic world.
By New Year, all Ukrainian lands must be liberated, and then sanctions, partners and even the Russian people themselves (maybe they are not idiots) must destroy their Russian Nazism.