You can put a time limit on shared items in Google Drive!

Did you know that you can set a time limit on folders and files that you share via Google Drive? More information can be found here:  https://support.google.com/drive/answer/2494893

When you share any file or folder in Google Drive with another user, the shared links will work forever unless you manually change the sharing permissions. For instance, if you have shared a document with an external vendor, they’ll continue to have access to the file long after your business contract may have ended. In such a situation, wouldn’t it be nice if you could set expiration dates while sharing files in Google Drive? For instance, share a document temporarily for, say, 10 days and access to the file should be revoked automatically after that period has passed.

Note that you can’t set expiration dates one files and folders  for people with edit access:

• If you set an expiration for someone with edit access, they will only be able to comment on the file.
• If you change someone’s access to “Can edit,” the expiration date will be removed.