"The seeming delay on God's part in answering some prayers is not due to any inability nor to a lack of willingness, as the Scriptures make clear. (Matt. 7:9-11; Jas. 1:5, 17) In some cases the answer must await God's 'timetable.' (Scripture citations) Primarily, however, it is evident that God allows his petitioners to demonstrate the depth of their concern, the intensity of their desire, the genuineness of their motive. (Scripture citations) At times they must be like Jacob in his wrestling long in order to obtain a blessing. (Scripture citations)
"Similarly, while Jehovah God cannot be pressured by numbers into acting, he evidently takes note of the extent of concern shown among his servants as a body, taking action when they collectively show deep concern and united interest. Where apathy, or a measure thereof, exists, God may withhold action."
AID TO BIBLE UNDERSTANDING, "The Answering of Prayers," page 1331, paragraphs 2, 3.