Final answer:
After drinking a large glass of water, a person's urine output typically begins to increase within 30 minutes as the body absorbs and filters the water.
Step-by-step explanation:
The time it takes for a person to start increasing their urine output after drinking a large glass of water can vary. Generally, it is expected that urine output will begin to increase within 30 minutes of drinking water. This is because the water needs to be absorbed into the bloodstream, filtered by the kidneys, and then processed into urine. It is important for the body to balance its fluids and electrolytes, and the kidneys play a crucial role in this process by adjusting urine output as necessary.