Status UPnP & NAT-PMP - Persistent Rules?

[Wolf666]

I would like to comfirm this behavior is correct.

I have several game consoles and everything work pretty well (PS4, PS5, Nintendo Switch get nat type 2).
I noticed now that in the Status UPnP & NAT-PMP the rules are kept for days even without using the game consoles, I remember (maybe I am wrong) that after some time those rules were cleared automatically, now I have to do it manually.

Below the status now, I used the PS5 one day before but the rule is still up.