Gretta slept for 180 hours and 23 minutes. Nat slept for 10,524 minutes. Who slept longer and by how much Gretta slept 4 hours and 59 minutes longer than Nat. Nat slept 4 hours and 59 minutes longer than Gretta. Gretta slept 22 hours and 36 minutes longer than Nat. Nat slept 22 hours and 36 minutes longer than Gretta.