Does Your UX Suck? Principle #5:The number of buttons needs to be reasonable.

The number of buttons needs to be reasonable, but what is a reasonable number of buttons?
The buttons of your navigation are generated by your content. It's essential that the content be well  organised into pages and the full Navigation system be well planned and easily distinguished. It is likely that you will end up with 2 or 3 navigation systems leading visitors around your site. The Primary Navigation needs to be visible above the fold. Standard names of primary navigation buttons are Home, About, Contact, Services, perhaps FAQs, Portfolio and a variety of others depending on the industry behind the website and shouldn't comprise any more than 7 buttons in total.

Why only 7?
Too many buttons never really was an issue for websites until the proliferation of mobile devices. The Nav systems you create on a standard website will need to adjust to work on a small screen device too, as your site will at some point become responsive. The primary Nav menu needs to be accessible from anywhere on the page. For touch devices, nav buttons become more and more problematic as the screen gets smaller, because there simply isn't the room for buttons as well as viewing area.

If you're committed to the idea of super light sites, an unreasonable number of pages isn't to your advantage either. Complex sites are heavier in MB and Google prefers super light sites. When the site components shuffle for the phone screen size, unreasonable amounts of information will need to be weeded out anyway.