If you are an admin, you can manage your invitations that were sent to the invited employees. On the Web, click on the gear icon at the top bar to access Configurations. On a mobile device, select More and Configurations, then Manage Invites. In the Manage Invites option you will see a list that has pending acceptance, with the invitation date and time stated. Clicking on Resend Invite on web, or swiping right to left in mobile device, will provide the ability to remind the user that an invitation is pending. You also have the option of cancelling the invite.