It takes the human body anywhere between five and 120 minutes to digest water. The process begins as soon as water enters the mouth and continues through the digestive system, with the majority of the fluid usually being absorbed in the large intestine.
Some factors affect how long it takes for water to be digested. If a person drinks water on an empty stomach, it can be present in the bloodstream within five minutes of ingestion. However, if a person drinks water with a meal, digestion may take as long as 45 minutes, as the body needs to process the food first.