“Seventy years before it reached the bottom”
Abu Umamah heard the Prophet say:
لو أخذ سبع خلفات بشحومهن فألقين من شفير جهنم ما انتهين إلى آخرها سبعين عاما
“If there was a huge stone as big as seven khalifaat stones, and it was thrown from the edge of Hell it would fly through it for seventy years before it reached the bottom”.
["Sahih al-Jaami Al-Saghir", 5124].