GTK Rekey Period

[netadmin]

Hello,

We have about 1000 APs and 3 vSZ-HS wireless controllers.

Here is the version of the controllers: 5.2.2.0.317
Now, I have to find out the GTK Rekey Period information.

But I haven't seen it on any of the pages.
First, what is the default value of the GTK rekey period?

And, how can I check or change this value?

Thanks in advance,

[Orlando_Elias]

@netadmin 
You can find the rekey option in the Advanced Options of the WLAN configuration: