It was narrated from Abu Hurayrah that the Messenger of Allah, peace and blessings be upon him, mentioned Friday and said: “On this day there is an hour when no Muslim slave stands and prays and asks Allah for something, but Allah will give it to him,” and he gestured with his hand to indicate that whatever he asks for, is as nothing to Allah
Sheikh Abdul-`Aziz ibn Baz, the late Mufti of Saudi Arabia, said: There are two opinions concerning the hour of response (sa`at al-ijabah) on Friday which are likely to be correct:
The first is that it lasts from after `Asr until the sun sets, for those who sit and wait for Maghrib, whether in the mosque or at home, making du`aa’ (supplication) to their Lord, whether they are men or women; whoever does that is more deserving of seeing a response to his or her du`aa’.
The second is that it lasts from the time when the imam sits on the pulpit to deliver the khutbah (sermon) on Friday until he finishes the Prayer. Du`aa’ at either of these times is deserving of an answer.
These two times are more likely to be the times of response on Friday, because of the sound hadiths which indicate that. The hour of response may also be sought at other times of the day; the bounty of Allah is great.
Among the moments when response may come to a du`aa’
in all Prayers, obligatory and nafl alike, is the moment of sujud (prostration), because the Prophet (peace and blessings be upon him) said, “The closest that a person may be to his Lord is when he is prostrating, so say a great deal of du`aa’ in sujud” (Muslim).
Muslim also narrated from Ibn `Abbas (may Allah be pleased with both father and son) that the Prophet (peace and blessings be upon him) said, “As for ruku` (bowing), proclaim the greatness of your Lord in ruku` and strive in du`aa’, for you will be more deserving of being responded to.”