6 to 8 hrs for digestion. it stays in the stomach for 2 hours and then in the intestine for another 2 hours. the undigested food goes to the large intestine and the digested food goes to whole body through blood. Carbhydrates and proteins about 1 1/2 -2 hrs. Fats 2 hrs.
And based on that a foetus does not posses self-awareness. Human babies have been found to become self aware between the ages of 18-24 months. The rouge test is a self-recognition test that identifies a human child's ability to recognize a reflection in a mirror as his or her own.
Most people look out for number one, themselves, which makes it strange to think that there was ever a time when we had no concept of âmeâ. A simple study dating from the early 70s suggests that before the age of around two years old we canât recognise ourselves in the mirror. Because of this study, and the many variations that have followed, some claim that it isnât until our second birthday that our self-concept emerges.