There are also no deadlines.
Proverbs 10:24 The fear of the wicked, it shall come upon him: but the desire of the righteous shall be granted.
When will our righteous desires be granted? In the Lord's own due time (whether in time or eternity), and in His own way, and according to His own will.
In other words, right now if it is expedient, later if we need to have some other learning experiences right now. Many things, such as a desire to rest from our labors, to be saved and redeemed and live with God forever in perfect peace in His heavenly Kingdom, come later (assuming of course that we follow the path that leads to it, see Matthew 7:14).
I wonder how many devout christians have wondered why their prayers and pleas to Yehoshua so save their infant children from (physical) death... failed, or the children that have prayed for a parent to be spared (physical) death... were let down, felt they'd been lied to.