I ran the entire campaign from start to finish last weekend for a group of 6 investigators. We started Friday early evening and wrapped up Sunday late afternoon (about 26 hours of play in total).
Wow, that's impressive! My gaming group also only gets together a couple of times a year - usually one in spring and one in the autumn - and plays through an entire weekend from friday to sunday afternoon with breaks only to sleep and eating (averaging about 26-30 playing hours per weekend). We recently finished Eternal Lies (where I was a player) after 9 sessions and a total of over 190 hours playing time (after almost three years). Now it's my turn to be the Keeper, and my keeping skills haven't been updated in a while, but I still think we will need more than 26 hours to finish CoN even if it isn't quite as big of campaign as Eternal Lies. Did your group skip something, or were they just really efficient?
My biggest concern with CoN is that it's "basic CoC", particularly after our group has played through Eternal Lies. I feel the EL campaign is more realistic with excellent motives and drives for the different antagonists with a pretty advanced plot that CoN - though good on it's own - can't quite live up to. As someone said, it's more of a old-school CoC, with each scenario based on "find an artifact and prevent it from falling in the hand of the bad guys", and a final goal of the Big Bad that isnt' really that special (a ritual to summon a God/Avtar and rule the world). The campaign has has a lot of good sections, with a nice overall feeling about being watched and followed all the time, and I quite like the number of NPC's that our investigators can encounter to make the world feel realistic, so I feel it has a good overall vibe that I'd like to use, but I'm a bit hesitant to the ultimate goal for the Big Bad. I like the idea of the Big Bad going for the most powerful person of the planet (at the time) to get the most power before performing the Ritual of Ascension, but it still feels like "summon-god-to-rule-the-world-and-become-its-right-hand-person-to-get-power". I know I can adjust it to make it more what I want, but since it has a lot of good stuff in it, it don't want to mess it up by adding my own stuff that suddenly doesn't make sense. It's a hard choice between using a pretty good basis provided by the campaign and adding my own adjustments (which might screw it up totally). I think the main thing I want is to bind the different chapters together with more handouts to make the PC's feel it's more cohesive.
And speaking of handouts, does anyone have handouts they want to share, besides those in the book? I'm talking about your own home-made handouts, including letters, book excerpts, newspaper clippings etc.? The ones in the book are pretty good, but I still would like more handouts (i.e. from diaries, newspaper clippings etc. that are mentioned in the text but without a proper handout). I will probably use ScottJBaker's Handout #18 (which is great!), but I'm wondering if anyone has done something for CoN akin to the Eternal Lies handouts-thread or omphalos handouts for Tatters of the King?