Hi, I'm a student at UM doing research on SEO. Does anyone in here know whether there is a limit on the amount of URLs that can be submitted to google.com/addurl/

If anyone can give me an answer or a link/email of a source that may be able to answer this question I would be very appreicative. Thanks in advance.

Well as far as i know it's not very helpfull / not working to add an url there. I've been told that it's better to get a link on a relevant website en get indexed that way.

Google is quite clear: "Only the top-level page from a host is necessary; you do not need to submit each individual page."

But you won't rank well without incoming links, so as WebSonic says you need to get some of those anyway.