Being timed out after 1440 seconds on your local dev machine is extremely annoying, here’s how to remedy that in two simple steps:
1.) Go to Home -> Settings -> Features -> Login cookie validity in phpMyAdmin and change it to 14400000
2.) Open the php.ini file: sudo gedit /etc/php5/apache2/php.ini. And change the session.gc_maxlifetime value to something like this: session.gc_maxlifetime = 14400000
In order to avoid having to type your password every time you run sudo this worked for me:
1.) Make sure you put this at the end of /etc/sudoers: your-user-name ALL=(ALL:ALL) NOPASSWD:ALL
From this article.