------+---------
 time | elapsed
------+---------
12:XX | XX - 30
 1:XX | XX + 30
 2:XX | XX + 90
 3:XX | XX + 150
 4:XX | XX + 210
 5:XX | XX + 270
------+---------
 time | elapsed
------+---------
 7:XX | XX
 8:XX | XX + 60
 9:XX | XX + 120
------+---------
 time | elapsed
------+---------
 9:XX | XX - 59
10:XX | XX + 1
11:XX | XX + 61
12:XX | XX + 121
 1:XX | XX + 181
 2:XX | XX + 241
------+---------
 time | elapsed
------+---------
 5:XX | XX - 58
------+---------
 time | elapsed
------+---------
 5:XX | XX - 58
 6:XX | XX + 2
------+---------
 time | elapsed
------+---------
 5:XX | XX - 59
 6:XX | XX + 1
------+---------
 time | elapsed
------+---------
 5:XX | XX - 59
 6:XX | XX + 1
------+---------
 time | elapsed
------+---------
12:XX | XX - 58
------+---------
 time | elapsed
------+---------
12:XX | XX - 58
 1:XX | XX + 2
------+---------
 time | elapsed
------+---------
12:XX | XX - 59
 1:XX | XX + 1
------+---------
 time | elapsed
------+---------
12:XX | XX - 59
 1:XX | XX + 1
------+---------
 time | elapsed
------+---------
 7:XX | XX
 8:XX | XX + 60
 9:XX | XX + 120
10:XX | XX + 180
11:XX | XX + 240
12:XX | XX + 300
 1:XX | XX + 360
 2:XX | XX + 420
 3:XX | XX + 480
 4:XX | XX + 540
 5:XX | XX + 600
------+---------
 time | elapsed
------+---------
 7:XX | XX - 1
 8:XX | XX + 59
 9:XX | XX + 119
10:XX | XX + 179
11:XX | XX + 239
12:XX | XX + 299
 1:XX | XX + 359
 2:XX | XX + 419
 3:XX | XX + 479
 4:XX | XX + 539
 5:XX | XX + 599
 6:XX | XX + 659
------+---------
 time | elapsed
------+---------
 9:XX | XX
------+---------
 time | elapsed
------+---------
10:XX | XX