Hadith 8808
عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ قِيلَ لِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَوْمًا كَانَ مِقْدَارُهُ خَمْسِينَ أَلْفَ سَنَةٍ مَا أَطْوَلَ هَذَا الْيَوْمَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ((وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهُ لَيُخَفَّفُ عَلَى الْمُؤْمِنِ حَتَّى يَكُونَ أَخَفَّ عَلَيْهِ مِنْ صَلَاةٍ مَكْتُوبَةٍ يُصَلِّيهَا فِي الدُّنْيَا))
It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that it was asked from the Noble Prophet (peace and blessings be upon him): "A day will be of fifty thousand years, how long will that day be?" The Messenger of Allah (peace and blessings be upon him) said: "By Him in Whose hand is my soul! It will be very light upon the believer; it will feel to him only as long as he spends in performing an obligatory prayer in the world."