@Kevin_Z I might have been unclear regarding details:

I'm not blocking Minecraft at all - my kids are allowed to play/use it. But I don't want them to play longer than a period of time. Therefore I use the "Time Limit" feature from "Home Care's" "Parental Controls":

For all (?) other websites or games this works pretty well :-) (many thumbs up!) But I see them playing Minecraft much longer than there "time limit" does allow.

==> So I thought that "Time Limit" might not close already open connections as Minecraft might deal with after I don't this wiki article on OpenWRT…

I'm a computer scientist with deep knowledge about TCP/IP, but not a Minecraft-Pro at all and I didn't find anything:

- if Minecraft (server or client invoking this?) keeps connections open "forever" and

- if tp-link's time limit/parental controls won't close open connections.

Because websites usually open and close many connections while surfing, this time limiting is working fine for this case (youtube for example, watching the running video up to the end and then "boooom! no internet anymore!" 

Many/some other games also seem to work like this and can also be time limited very easily.

But what about Minecraft?

What about closing open connections if Minecraft is designed this ways?

Kind regards for any help that make me help to understand WHY time limits won't or can't end Minecraft sessions at all!

Seems like the problem is "known" and very old for other models, too:

https://community.tp-link.com/en/home/forum/topic/97330

But still unresolved