Generally speaking it has no effect. My name is Humberto Valle, I'm an MBA and marketing strategist for http://Unthink.me for almost 10 years. I deal with SEO often. The thing you have to consider with SEO is that for development you simply need to make sure that your page structure is well thought out and easy to follow, XML sitemaps are key for good SEO and having easy flows and hierarchies allows for search engines like Google to index you a lot easier and faster which yields higher exposure. Best of luck, if you are looking for more SEO advice or help check out our blog, we have some handy posts there.This one for example is for SEO Newbies, if that's your case. http://blog.unthink.me/how-long-does-seo-take