Restricting the users' access with a time-frame isn't an option for now. However, you can limit their view by setting the users' restrictions to access the inventory section only. This way, they'll only be able to access that portion in QuickBooks.
On the Users and Roles screen, highlight the user's name and click Edit...
Under Available Roles, look for Inventory and hit Add.
Once added, click OK.
To help guide you more about the users and restrictions in QuickBooks, check out the following resources below: