User sessions are completed in Dynatrace after 30 minutes of user inactivity or when the user closes the browser or when session is closed explicitly using the Dynatrace JS API from you web application.
That's why you typically see sessions completed after 30 minutes as this applies. Just FYI - you can't set the 30 minutes interval to another value.
Certified Dynatrace Master | Alanata a.s., Slovakia, Dynatrace Master Partner
