Way back when I had just gotten skilled rank, I did my first expert (city) and it took me hours. The entire map up until the last cp (when you can claim the old one from on top of the building) took me maybe 20 minutes, but that last cp took AGES. Keep in mind this was pre-buff, the jump from the slab to the iron trapdoor but that ladder can make it a hh was a nightmare (keep in mind I didn't know anything about momentum at the time don't bully me please D: )