As of LCOS 10.80 you can set the new parameter under in the section NetFlow/IPFIX with Active-Flow-Timeout.
- Active-Flow-Timeout
- Defines the interval in seconds after a running data stream is exported via Netflow. This makes it possible to run longer sessions, e.g. to export large downloads at runtime. Subsequent traffic is classified as a new data flow, and the logging of the data traffic by the collector starts again. Possible values: 60–1800 seconds (0 turns the function off)