Total number of contacts that are associated with your HubSpot, Marketo and / or G-Suite account(s) broken down by contacts that have engaged (opened or clicked at least one email) or have never engaged in your email program.
w/ Optimal Time signifies that these people have engaged in at least one email that you've sent to them out of HubSpot or Marketo or have sent you or responded to you from an email in G-Suite.
w/o Optimal Time signifies that these people have never engaged with you.
Note: The number of contacts in Seventh Sense may be higher than the active contacts / leads in your marketing platform. The reason for this is typically that you've performed a purge of contacts / leads in the past and in the backend marketing system, they were not deleted.