This tutorial assumes you are already logged in to your admin control panel
Joomla uses session lengths to automatically log out users that have been inactive for a set amount of time; the default is 15 minutes. Let's see how to change this
1) Click Site
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2) Then Global Configuration
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3) Go to the System settings
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Scroll down and right
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4) Change the number of minutes next to Session Lifetime
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Scroll up
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5) Click Save
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The session will now last an hour and a half before expiring
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That's it! You now know how to change the session lifetime in Joomla