Google - Using more than one account in Chrome
This is a great tip if you switch between your school account and another account on your machine. It allows you to have different profiles going at the same time, each with its' own bookmarks, extensions, apps, etc.
Look for the button in the upper right hand side of your chrome screen. It should say your name. Click on your name and choose "Switch person."
Expiration Date on Documents
Click on the Share button and choose "Advanced."
Next to the person you want to set the expiration time - hover your mouse until you see the clock - click on the clock.
Date choices are 7 days, 30 days and Custom Date where you can choose from the calendar the exact date you want.
Save Changes and the expiration time is set.