Floating Simulation

[pingus]

Hello

What is the time for a Simulation Node for release the licence after the end of a simulation over Network & floating licence server.

Here's my application test :

I've got a floating server working fine ( 2 working licence + 4 simulation)
I submit a simulation job over network (thinkbox deadline).

I install FumFX, in SL mode, on a first render node => works fine => I stop simulating on this manchine. (SL licence should be released at this moment)
I instal fumeFX, in SL mode, on few more render nodes => begins to fail simulating.
And now AfterFLICS tool on my server is marked as "All licences are in use" while i don't have anymore simulation running.

How can i reset the use of a licence by a SLnode ? Does the SLnode gives correctly the information that he stopped the simulation ?
What is the duration of a 'session' after a SLnode pick a licence ?

Thanks !
-p-