DevSin, I actually haven't proven it, I've only come up with a reasonable guess. The straight way to prove the hypothesis would surely be checking the codes, but that's beyond my competence. Knowing the minutes exactly isn't possible either, so I can only base my guess on statistics
So if say, 2/3 of all times the triggers interpreted X hours on the game clock as X (and 1/3 as X+1), then my guess would be, that time between (X-1):40 and X:40 was interpreted as X. Likewise, if it were 4/5 and 1/5, it would mean time between (X-1):48 and X:48. But since I got 50-50, the most reasonable hypothesis is that time between (X-1):30 and X:30 (or X:29, that's not very important here) works as X hours