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Many they are who have filled their lives with so much activity they do not have time to pray.
Mat 13:22
He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.

They have time for everything else, reasoning within their hearts that God understands their placing Him last in the allocation of their time.
In other words, they consider prayer as a gross waste of time.
In their case they are right, because God won't answer prayers rendered with leftover time.
In all things, God must have top priority, even in the allocation of our time.
Col 1:18
And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all [things] he might have the preeminence.
Eze 44:30
And the first of all the firstfruits of all [things], and every oblation of all, of every [sort] of your oblations, shall be the priest's: ye shall also give unto the priest the first of your dough, that he may cause the blessing to rest in thine house. (Jesus Christ is our High Priest)

Put walking with God above all other things and place Him first in all things.
Mat 6:33
But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.

First fruit prayers and offerings are always received by God.
Deu 26:2
That thou shalt take of the first of all the fruit of the earth, which thou shalt bring of thy land that the LORD thy God giveth thee, and shalt put [it] in a basket, and shalt go unto the place which the LORD thy God shall choose to place his name there.

When God is first, prayers are answered.
Mat 6:33
But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.