The Jesus Freaks Will Hate This

[Mr Greene]

What evolution deniers need to understand is that speciation can take thousands or hundreds of thousands of years. It will happen eventually. The fact that you demand it happen within an arbitrary timescale convenient to you is irrelevant. It's like saying a car can't get to 60 mph if it doesn't get there in 2 seconds.

We have seen it happen, in organisms with a short life span. The fact that you personally haven't witnessed it is also irrelevant.

I think you're using the wrong units, evolution works across generations rather than years. Thus a species with a short life cycle will evolve faster than one with a long life cycle. This is why geneticists use Drosophila as it has a life cycle of 10 days. As such we have bred different species of Drosophila as previously noted.
Huggy will now stick his fingers in his ears and recite the 'La-La'La' song...