Good question. We use about 70,000 tons a year as fuel for reactors and for military weapons. Uranium, like any raw material commodity under the political economy of Imperialism reserves of it depend on what the price may be, per pound, at any given time. When the price goes down, the "amount" of "economically recoverable reserves" goes down. When the price goes up, suddenly the amount goes up as well. So the simple answer is "decades". The number of decades has gone up as the price I believe is now up over $100lb. On the other hand, with so many reactors starting construction and going online (mostly in China for now) that supply might dwindle some. On other hand, again, both reprocessing of older Spent Nuclear Fuel and the advent of fast reactors, means we can use the SNF over and over again while "breeding" new fuel. And then there is Thorium, which can be used in its raw state...and several dozen countries and companies are working on Thorium reactors.
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