praying until the burden is gone
And he went a little further, and fell on his face, and prayed, saying, O my Father, if it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt.
And he cometh unto the disciples, and findeth them asleep, and saith unto Peter, What, could ye not watch with me one hour? Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak.
He went away again the second time, and prayed, saying, O my Father, if this cup may not pass away from me, except I drink it, thy will be done.
And he came and found them asleep again: for their eyes were heavy. And he left them, and went away again, and prayed the third time, saying the same words.
I once heard a minister say that he prays until he gets a stop from God, a feeling from God that his prayer has been heard. Sometimes that stop take only a moment, sometime it take years to get that stop. But each time he gets that stop, he knows God has answered his prayers
Soli Deo Gloria