Room size and room duration.

[Zeino]

What about making it so training rooms have no impact on the 3 hours activity instead of decreasing the rooms capacity/duration?

That's even worse. As an active player I'm saying is, lot of people in this server enjoys to stay in training rooms to hang out with friends and chill. Just like Linzor said, most of those players are not even afk. If training rooms get removed from impact on 3h activity, I'm sure we'll lose even more players.

However I think there should be a timer on training rooms.

I disagree again. Let the players have freedom to play about how many hours they want to play in a room. Doesn't matter if it's training or any other mode. If you want to play in other modes or maps try to make those rooms and wait a bit to get other players join.