Once logged in your login is valid for long period of time, you will not be logged out. You are only logged out if you choose to logout or another user/hacker has accessed your account using your login details. Be sure no other users are using your login details to access your account as this could be a sign of an attempt to hack your data. To protect your companies data be sure your password is secure and not guessable, real words or short.
For ideas on creating a good password this page on howtogeek.com might help