Each website takes a different time to make. It comes down to how much you already have designed and how much content you already have. In terms of design, we're talking about in depth thought about the site or actually drawing something out. For content, we're talking about text, images, videos, or anything that users of the site will want to see. Another big factor is complexity. If you have a really simple idea, your site can be made quickly. Larger ideas take longer.

A brief estimate:
Basic sites: 2-4 weeks
CMS: 3-6 weeks
Advanced sites: 5-8 weeks