This is a bit like asking "How long is a piece of string?" Are you asking about evolution from the emergence of life or the evolution of a single species?
Even the evolution of a single species can be different times, depending on the species. There is no hard-and-fast answer.
If you want a precise answer you will have to frame your question more precisely.
The whole process of evolution from the first emergence of life to now has taken some 3.8 to 4 billion years. The earth is about 4.5 billion years old. So it was lifeless for about half a billion years before the single-cell organisms started to emerg (very slowly).
With the fruit fly (Drosophilia) because they reproduce quickly many generations can be witnessed in a short while, changes in genetic coding can be observed over a couple of days. Scientists have managed to create mutations and grow limbs where antennae should be by adding or removing specific genes (HOX B I think it is). that is why drosophilia is used by evolutionary scientists. In humans gene coding can be a couple of generations see the way they breed dogs and animals for size and colour etc, it could take two generation for a gene to be altered.
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