@pitulnik, it says that for everyone's open games. To have it being advertised again, you need to go to "add or remove players" and every open seat, you need to remove, and then out back in.
Well, you don't need to remove the open seats, just go to add or remove, then change noting and go back.
There is a different timer for real-time games and multi-day games as well. Also, the open game can still be joined, if you give someone the link to it for example, even if it is not being advertised.