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It takes between 2-4 hrs for food to leave the stomach & it takes less time with water; absorption of water takes approx. 30 min. [ Source: http://www.chacha.com/question/how-long-does-it-take-the-body-to-absorb-water ].
If you are wanting to know how long might it take for the kidneys to filter out some contamination that was in a glass of water you drank that is an impossible question as the contamination might be such as to become embedded in some body tissue and may never be filtered out.