Is a
    day with Allaah one thousand years or fifty thousand years?
Question

                Bismillahir rahmaanir raheem, asalaamu
      'alaykum, please answer, this is very important:Does Allah's day equal to 1,000 human years (Sura 22:47, 32:5) or 50,000
      human years (Sura 70:4) Jazakallaahu khayr.
Praise be to Allah.Shaykh Muhammad al-Ameen al-Shanqeeti said in his book Daf
    Ayhaam al-Idtiraab an Aayaat al-Kitaab (p. 158):
The aayah (interpretation of the meaning) And,
    verily, a day with your Lord is as a thousand years of what you reckon [al-Hajj
    22:47] indicates that the length of a day with Allaah is a thousand years. The same is
    indicated by the aayah (interpretation of the meaning) He arranges (every) affair
    from the heavens to the earth, then it (the affair) will go up to Him, in one Day, the
    space whereof is a thousand years of your reckoning. [al-Sajdah 32:5]. Another
    aayah indicates something different (interpretation of the meaning): The angels
    and the Rooh [Jibreel] ascend to Him in a Day the measure whereof is fifty thousand
    years [al-Maaarij 70:4].
There are two ways in which these aayaat may be reconciled:
The first was reported by Ibn Abi Haatim via Sammaak from Ikrimah
    from Ibn Abbaas: the day of a thousand years mentioned in Soorat al-Hajj is one of
    the six days in which Allaah created the heavens and the earth; the day of a thousand
    years mentioned in Soorat al-Sajdah is the length of time it takes for a matter to go up
    to Allaah; and the day of fifty thousand years is the Day of Resurrection.
The second (way of reconciling the aayaat) is that what is meant by all
    of them is the Day of Resurrection, and the difference in the time span depends on whether
    a person is a believer or a kaafir. This is indicated by the aayah (interpretation of the
    meaning): Truly that Day will be a Hard Day, far from easy for the
    disbelievers. [al-Muddaththir 74:9-10]. These two suggestions were mentioned by
    the author of al-Itqaan. And Allaah knows best.