Time distribution on each floor 4:04 4:13 3:38 6:22 3:19 (5F) 4:52 4:23 6:21 4:21 3:54 (10F) 3:54 3:52 5:31 5:03 4:35 (15F) 4:02 4:25 7:29 5:44 6:17 (20F)