Auth::setExpire() -- set expiration time for authentication
Description
     With this function you can set the maximum expire time that is
     used by auth to a new value.
    
Parameter
     
- integer
        $time
 
         expiration time, 
         number of seconds
        
- boolean
        $add
 
         if TRUE $time 
         is added to the existing expiration time,
         if FALSE the exitsing time value will be replaced.
        
 
    Note
This function can not be called
statically.