APM webtop to Citrix - what timeouts control session traffic stopping?

Hm.. something does not add up. I just tested in my environment, which is 11.6.0 HF5 based, and I see traffic stop as soon as the application is closed. It might be worthwhile to open a case and supply a full tcpdump with details as to when the user exited the application and from which point on the traffic between the BIG-IP and XenApp server is still flowing. In my scenario, traffic on port 2598 ceases as soon as the application was exited.