The answer depends very much on the volume of water in a particular place (it varies greatly around the world) and on the rate of consumption (also highly variable).
Groundwater aquifer volumes are poorly estimated in most areas of the world – they are probably less well known than reserves of oil. Also, while in some cases the aquifers’ recharge rates are clearly lower than consumption (resulting in net loss and decline), such aquifers can recharge on human scales (unlike oil and natural gas reservoirs) as long as it rains and if consumption can be curtailed.
So it is really impossible to make a reasonable estimate of times the water will be available for most individual aquifers, and much less so for heterogeneous world aquifer systems taken as a whole.
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