Pacing mechanism. If they allowed 24 people on phase 5 to face roll crystal tower in one day you would all be back here complaining on the forums that you don't have anything to do.

You can't have it all. You can't have meticulously crafted content in your MMORPG without pacing mechanisms to keep those with no jobs in real life from devouring in in 2 days.

MMORPG players will always devour content faster than developers can release it, which forces pacing mechanisms like this.