session time out randomly

I use this in bootstrap file: set session time out on 60 means 1 hour, isnt?

// set security to low  Configure::write('Security.level', 'low');    // reconfigure session  Configure::write('Session', array(      'defaults' => 'php',      'timeout' => 60,      'autoRegenerate' => false,      'checkAgent' => false,      'cookie' => 'myappsid_',  ));
 

but my session expired about 4 or 5 mintues ... what's problem ?

i'm using cakephp 2.4 stable

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