if you want to know for sure you can build a simple light training countdown spreadsheet like the one I built.....(partial copy/paste, unformated for this post)
AGE TO DAY BT/DAY BT/CUM
280 0 6 6
280 -1 6 12
280 -2 6 18
280 -3 6 24
280 -4 6 30
280 -5 6 36
280 -6 6 42
280 -7 6 48
280 -8 6 54
280 48 6 60
280 47 6 66
280 46 6 72
280 45 6 78
280 44 6 84
280 43 6 90
280 42 6 96
280 41 6 102
280 40 6 108
39 6 114
38 6 120
37 6 126
36 6 132
35 6 138
34 6 144
33 6 150
32 6 156
31 6 162
270 30 6 168