Yes, and Skin Game and Ghost Story each had 51 chapters, though Ghost Story had over 10,000 more words than Skin Game.  So now that Jim has reached chapter 49 he must be getting near the final boss battle chapter, if he isn't there already.

However, I wouldn't be surprised if Peace Talks has as many chapters and words as Cold Days because there are a large number of potential subplots for Harry to deal with, no matter how well Jim can combine them into a single story.
 
I've commented on this topic before.  One day, several years ago, while waiting for Cold Days to be released I started going back through Jim's twitter feed to see when he had announced, "The end.  I just finished (fill in the blank), now it goes to the publisher for ..."  Then I compared that date with the release date of that particular book.  I went back as far as Jim's Twitter feed went.  What I found was most of his books were released within 9 months after Jim's Twitter announcement.  There were some noticeable exceptions.  I think one book took a year or a little longer to be released.  Another was published just 3 1/2 months later; however, I believe Jim said that novel (I think it was Changes.) had already been very heavily pre-edited before he sent it to the publishers so both the publishers and Jim had much less work to do to get that one ready and out the door.  I think there was one other book that was released about 5 months after Jim's "The end" announcement.  There were also one or two books that were released within 6 to 8 months after Jim announced he had finished.

That's why I think it's likely we will get Peace Talks in time for Christmas.  Here in the U.S., publishers like to get best selling books out by the end of November to maximize sales during the Christmas season.  So unless Peace Talks needs a ton of editing and rewrites, the publisher will do their best to get it out before the end of 2019.   

Yeah, I'm feeling this too. I won't be upset or anything if it doesn't happen, but things to seem to be lining up for the book to release before the end of this year. Unless Peace Talks turns out to be MUCH longer than every other book in the series, which I think is unlikely.

What is the time frame for the signing, roughly? I ask because this other guy named Brandon Sanderson is doing a signing for his new Mistborn novel literally the exact same date and time about a 10-minute drive from here at a different bookstore, and I'd love to be able to go to both signings, but I wasn't sure how that would work, time-wise.

Unless, you know, Jim and Brandon want to tag-team and do a joint event of some kind  ... I actually ran this by Brandon on twitter and he said that he might see if he and Jim could team up somehow. I realize this may be impossible due to already being committed to different bookstores, but that would be REALLY awesome!