title: Default expire time for a cookie in Rails
body: <p>What is the default expire time of a <a href="http://api.rubyonrails.org/classes/ActionDispatch/Cookies.html" rel="noreferrer">cookie</a> in Rails (3.1.3)?</p>
  
  <p>I have found documentation on how to set, how to retrieve, but I fail to see the default expire time.</p>