Am I interpreting the pic correctly that the horizontal differentiation is based on different stages? That would mean that Bruce would play the penultimate slot on one stage, preceding Saxon, while Mass Hysteria would play at roughly the same time on a different stage, before the Metallica show. There would probably be a considerable overlap, so it's unlikely for someone to be able to watch the entire Bruce, Saxon and Metallica shows.
That said each day has a band that I vastly prefer to everything else on that day, starting with Cradle Of Filth, then Pain Of Salvation, Bruce of course, and finally Dimmu Borgir.