Jesus was on the cross for approximately 6 hours. According to the book of Mark, the crucifixion began at 9 a.m. on what was likely April 3, 33 A.D.
Jesus died around 3 p.m., according to scripture. He was only sentenced 3 hours before he was placed on the cross. Jesus was accused by the Jewish theocrats for inciting rebellion and claiming himself as the king. In ancient times, those found guilty of certain crimes were stoned to death, instead they chose to place Jesus on the cross. Placing him on the cross was done in order to dissuade others from contemplating similar crimes. Once crucified, some people lived for days.