Hi there, @Jen_M. 

Thanks for following my steps listed above. 

To see these preferences, you'll need to be logged in as the company Admin user. If you're not the Admin, you won't see the Manage Login settings. 

The lowest amount of time the duration can be set for is 1 day. With that said, does your employee log out each day? When they log out, are the going to File>Close Company/Log off? If not, I encourage them to log off this way. This is the proper way of logging out of the company file. If they're only hitting the red X in the corner of the screen, the file has not fully closed and can continue the time duration period. Thus, causing them to be automatically logged out once the duration period has ended. 

I also wanted to ask if you notice this happening if another user logs in at the same time the user gets logged out? If this is the case, you'll need to up the amount of users you have staying logged in at once. If you need to up the amount of users license you have, you can contact our Customer Support Team at anytime, and an agent will help you do so. 

Should either of these scenario's not be the cause, then there could be the possibly that this is a broken user. Broken users can happen over a period of time. Don't sweat it. You can resolve this as easy as 1, 2, 3. 

To resolve a broken user, all you'll need to do is delete and add the user back to your company file. No data will be lost during this process. I've included the steps to delete and add the user below. 

To delete user:

1. Sign in as the QuickBooks Admin.
2. Go to the Company menu, then select Setup Users and Passwords and then Set Up Users.
3. Highlight the user, then click on Delete user. 

To add user:

1. Go to the Company menu, then select Set Up Users and Password and then Set up Users.
2. Tap on Add User...
3. Fill out the User Name, Password, and Confirm Password fields, then hit Next.
4. On the Access for user: (username) window, choose which area of QuickBooks the user has access to, then click Next.
   • If you choose Selected areas of QuickBooks, you can customize the restrictions for different areas of the company file for the newly created user by selecting No Access, Full Access, or Selective Access.
5. When done, hit Finish.

For additional details about this process, check out QuickBooks Desktop Users and Restrictions. 

Please let me know if you have any questions or concerns. Have a wonderful day!