Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "On the Day of Resurrection a span of fifty thousand years will be set for the disbeliever, as though he had done no deed at all in the world; and the disbeliever will see Hell from a distance of forty years' travel and will think that he is about to fall into it."
Ahmad and Abu Ya'la recorded it, and its chain is hasan (good), although there is weakness among its narrators.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البعث / 18340
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه أبو يعلى فى المسند (1385) اخرجه احمد فى المسند (75/3) ، أخرجه مسند أحمد برقم: 11317، وأخرجه صحيح ابن حبان برقم: 7352»