A time-based isoline, also called an isochrone, can be requested using
range[type]=time and providing
range[values] in seconds.
The request below calculates a 5-minute isoline for a car around the center of Berlin. The response answers the question: what area can I reach by driving for five minutes?
curl -X GET \ 'https://isoline.router.hereapi.com/v8/isolines?transportMode=car&origin=52.51578,13.37749&range[type]=time&range[values]=300'