How Set Interval of Geolocator.getPositionStream()

Question

I have to increase the call time of setLocation() because I spend so much on google APIs (in 2 days 100€ and I am only testing the app). I have tried timers and debounce functions but have not yet been able to come up with a solution.

updateDriversLocationAtRealTime()
  {
      streamSubscriptionPosition = Geolocator.getPositionStream()
          .listen((Position position)
      {
          driverCurrentPosition = position;

          if(isDriverActive == true)
          {
              Geofire.setLocation(
                currentFirebaseUser!.uid,
                driverCurrentPosition!.latitude,
                driverCurrentPosition!.longitude
              );
          }

          LatLng latLng = LatLng(
              driverCurrentPosition!.latitude,
              driverCurrentPosition!.longitude,
          );

          newGoogleMapController!.animateCamera(CameraUpdate.newLatLng(latLng));
      });
  }