I felt the ledge scene went on forever. I genuinely was hoping one of them would fall off to add some excitement.

Seriously though, was there any need for prolonging the agony to us the viewers of watching a few celebs standing on a ledge? Why not at least make them do a bungie jump or at the very least cut the whole scene to a quarter of the time?

I think they shot themselves in the foot by having so many trial elements where the celebs had to 'count to 60 seconds' - they have to prolong things each time, 'cos they can't jump straight out of it.
Having said that, it was quite a mesmerising way to start the show, especially the plank.

Well they must have spent shitloads on that setup on the roof, so they needed to make the most of it... Shame the weather was bad.

Yes its usually 90 minutes so 2 hours is a bit long

I thought it was good because it kept us in suspense.