What is the recommended maximum lenght of an url, if any ? For example: Would this be too long: I know it is possible wnad browser will support it, but, is their a recommended lenght as per search engines ?
i don't think there's a maximum length... you you ever seen a url that looks like this: www (dot) google (dot) com/analytics/reporting/browser_version_detail?id=4050360&pdr=20080119-20080218&cmp=average&d1=Internet%20Explorer&d2=7.0&tab=0&view=1&tchcol=0 that's a google URL - it seems like it's fine. I don't know if that's the same though, this url is a script-generated url... not sure if they're treated the same way.
I'm not an "expert" on this, but I would confidently say the one in the example is fine for SEO. I did read something about Google not liking URLs with too many parameters though.
I think that the example URL you've posted should be okay - but I do agree that if it gets much longer, it can look spammy. There shouldn't be any reason to have a URL any longer than that.