How many links a page might reasonably have?

Google’s recommendation to “Keep the links on a given page to a reasonable number.”

Matt Cutts Said:

If a page started to have more than that many links, there was a chance that the page would be so long that Google would truncate the page and wouldn’t index the entire page. These days, Google will index more than 100K of a page, but there’s still a good reason to recommend keeping to under a hundred links or so: the user experience. If you’re showing well over 100 links per page, you could be overwhelming your users and giving them a bad experience. A page might look good to you until you put on your “user hat” and see what it looks like to a new visitor. But in some cases, it might make sense to have more than a hundred links. Does Google automatically consider a page spam if your page has over 100 links? No, not at all. The “100 links” recommendation is in the “Design and content” guidelines section, and it’s the Quality guidelines that contain the things that we consider web spam (stuff like hidden text, doorway pages, installing malware, etc.). Can pages with over 100 links be spammy? Sure, especially if those links are hidden or keyword-stuffed. But pages with lots of links are not automatically considered spammy by Google.