Many spectators didn't observe any thing extraordinary during those six hours, for them they were six regular hours in any given day. If God really ordained his own crucifixion during these six hours then these six hours are full of triumph, because within these six hours God gave us three strong points on how to anchor ourselves to the cross. This anchor is strong enough to resist any storm that life can throw at us. Seis horas de un viernes by author Max Lucado. Published by Interforum. This book has a 13 digit ISBN number 9782190335803 and a 10 digit ISBN number 2190335809.