First I know nothing about .js!

Can you tell from this little snippet when the cookie is set to expire?

this.set_cookie(kw_cookie, new_kw, 86400 * 365);

Does the 365 indicate 1 year?

If you wanted it to expire in say 30 days, would it say 30 days there.

If I have the wrong snippet please let me know and I can copy and paste the thing in it's entirety.