It seems to me on the other ships they averaged a thousand tons an hour, but they were only using 2 cranes. They are using all three cranes with this monster ship so 1500/tons/hour? Then all we need to know is how may hours a day they work loading.. If they work 24 hrs/day, 3-3 1/2 days maybe..  8 hrs a day, maybe 8 or 9 days to load, rough guess..