The small intestine is the largest part of the gastrointestinal system at 22 feet long. The large intestine spans only 5 feet. The stomach can hold up to a quart and a half of food and liquid and takes four hours to fully digest a meal. Food passes through the small intestine at 0.002 mph - it moves at 0.00007 mph in the large intestine.
Stomach acid is similar in strength to that of a car battery.