Lol.. This question can't be given a definitive answer... As everyone has suggested, it all depends on the skill of the designer and also, the number of designers involved.

For me, creating a website can be broken down as follows:
- 2-8 hrs on layout (oh yeah... finding the perfect layout is a pain in the a**)
- 3-10 hrs for designing in photoshop
-1-3 hrs for HTML + CSS coding
- 1-3 hrs for all the eye-candy (AJAX - JavaScript)

Once you have completed the first page, subsequent pages can be coded pretty quickly!