Does anyone have an opinion on this?

About two weeks actually. It's very short lived.

http://chickscope.beckman.uiuc.edu/resou...oring.html

Wow. If it's only two weeks, then chicks grow quite fast. I remember one of the chicks I had being ~10 inches tall at some point but still retaining some of its (blue)color. So I assumed the color stayed a month at the very least.

Uff, my sense of time sucks.