I disagree about this. Populations can evolve rapidly within a few decades if the selection pressures are significant enough. If you look at the farming industry, there are many examples of evolution happening very quickly due to artificial selection pressures. Within a few decades, cows evolved to produce much more milk, chickens evolved to grow faster and produce large amounts of eggs, fruits evolved to have smaller seeds, grow faster and look better.

Artificial selection pressures created by humans have a way of greatly speeding up evolution.