How long does it take to evolve?

I disagree. As an argument against evolution IC is fatally flawed. Otherwise the basic concept is fine.Even in Darwin's Black Box Behe admitted that IC systems could evolve "indirectly", offering only an opinion that it was too unlikely. Later he retreated further, offering a different definition of IC (that never caught on). More recently he has dropped the IC terminology and is still looking hard for systems that could not evolve. He hasn't found any.

Nagel seems to be pushing his own opinions and does not seem to be that well informed on the subject.Elliot Sober, as a specialist in the philosophy of science, and biology in particular, is better qualified than Nagel in these matters. here is his review of Nagel's book, Mind and Cosmos.