How quickly could animals evolve?

So, in the world I'm creating, humans have meddled with animals in order to create unicorns, dragons, jackalopes ect. However, some of these animals were more powerful and intelligent than intended, and wiped out the humans.

In my world, set long after this incident, I want all animals (minus fish and insects) to be intelligent, able to communicate with each other and use tools and equipment. My question is, how long would it take for the intelligent 'magical' animals to make/modify/otherwise 'awaken' the normal animals to be intelligent? Also, how could they do it? Would it have to be magic or is there a plausible scientific reason?

Edit: If possible, I'd like the explanation to be scientific, through gene manipulation or what have you!

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How quickly could animals evolve?

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