As you may very well know it takes a lot to keep this site up and running. The Hokage and the Ninjas of the Villages need a break sometimes to rest their minds and bodies. The Hokage Will Post when Those times are. The vacations usually last for no more than a week. But while the Hokage is gone, You can still log on and do your missions, but The Hokage will have to accept or reject them when he returns from his Vacation.