Over 25 years ~ 8.2 million ounces.
In that time frame I expect gold to go from being 'prosperity driven' to that of 'major event driven' and the $740US trailing average could be much higher in US$ terms.
Looking back at the 68 year gold cycle, inflation really blasted off in 1933 and as long as there is no gold standard, it doesn't appear that the Powerz will switch from quantitative easing anytime soon and while asset values continue to deflate causing a deflationary smokescreen to enable the printing presses, the cost of groceries, healthcare and education continue to rise.