I would have bacteria and, yeah, it would grow in what we call the danger zone, which is typically between 40 and 140. But if I'm getting something out of my refrigerator where it's been basically pretty clean and I'm putting it on my counter, what exactly is going to happen in that amount of time that going into a hot oven isn't going to kill? Nothing.
Alton BrownWhat happens is that in each clump you've got the gelatinization of starches, which happens very quickly at the surface of the clump and it kind of forms a protective skin around this dry hunk of flour.
Alton BrownWhat tends to happen is that people will go - they've got hot broth, you know, they've added some liquid to their drippings, they've brought that up to heat. And then they try to add in a big clump of just kind of a handful of flour, and of course, it turns into library paste.
Alton Brown