You, the client, are responsible for checking talent work sessions frequently. We recommend checking Slack daily or more to ensure they are only tracking time for tasks essential to your project. You should communicate clearly with your talent to “spend no more than X work sessions on feature Y” or to “check in after Z work sessions to evaluate progress and plan how to proceed”. The easiest way to do this is to download the Slack desktop and mobile apps (download here) and turn notifications on, so you’re always in the loop on your project.