title: Multiple login system with different session time out in Codeigniter
body: <p>I am working on a project in codeigniter and it has 3 different login system eg. admin, sub admin, client. I have to make different session time out for different type of user like admin session time out 5 min. sub admin time out 15 min. and client session time out 30 min.
  Any suggestion how to make it happen.. Thanks in advance..</p>