Problem on session

Hi
I have cake 1.1.13
I have this problem on session.
My session is setted in this way in core.php:

define('CAKE_SESSION_SAVE', 'cake');
define('CAKE_SECURITY', 'low');
define('CAKE_SESSION_TIMEOUT', '288');
(Session time = 24 hour )
Now I noted in tmp/ where there are session cookies that these , after
1 hour and 30 minutes , is removed.
Even if i have my browser always opens on the page of my application.
Is a parameter of php.ini to set to haven't this behaviuor or is a bad
configuration of CakePHP?
Can someone help me?
Thanks
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