I have to agree about the timers. Timers on guildleves don't matter too much, though I don't really see the point, either. What I really can't comprehend is the focus on time in dungeons. Why exactly are we expected to speedrun them? Who figured that running past as many mobs as possible should be the goal?

I suppose the timers are in place to limit the number of players in instances but this is not the solution. This is yet another example of SE trying to prevent unwanted things by punishing the innocent. According to their logic the best way to prevent instance bloat is to close down the dungeon entirely. They also combat RMT by making trade as difficult as possible, because if there is no economy, RMT can't infest it!