When did setting deadline begin? Perhaps when people realized no things are getting done, time seems to be running out and goals are slow at being achieved, etc. Even though time is not ours but of God, the more we should maximize it for the good. And sometimes when a wish to have a target date on something enters our mind, we pray that it is a time that God would also agree upon for it to happen.
Whenever we think we are in control or we want to control things our way, let us be reminded that it is God who is in control and pray for guidance. That would then leave no doubt in us for He always knows what's best for us. Our heart's desires fueled by perseverance, along with His blessings will surely come true. We just got to have a strong faith.