I think a man-year is 2200 2080 hours.
Still, that’s 1.8*(2200 2080) = 3960 3744 hours
And over three years, that works out to an average of about 3 hours 37 25 minutes per day.
No wonder he took 425 days off 
Edit: because for some reason I typed in 2200 when I know the figure is 2080
