Since my site serves worldwide users, I feel it must comply with EU laws, especially the cookie law. I have some things on my site that uses cookies to save user settings, but on the EU laws page at http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm, it states:
user‑interface customisation cookies such as language or font preferences, for the duration of a session (or slightly longer)
I want to make my cookies last longer, but now I think long lasting cookies are hurting my adsense income greatly because then adsense believes I'm breaking EU law and thus I'll make less from visitors in the europe region, and on the slow days, those visitors were helping with my income.
Now my question is What exactly does "slightly longer" mean in the EU law? Does it mean something like I can't have a cookie last longer than the session time plus a couple of seconds or what?