Assuming Jim's right about his estimates hopefully yeah.
Cinder Spires done by his birthday 26th of October
12 Months by jan or feb next year.
I hope that estimate is accurate, but it didn't make sense to me. Jim said he was 40% finished with the Cinders Spires book and he hopes to be finished by his birthday on October 27th. The first Cinder Spires book's word count was just over 188,000. Let's say the next book a bit longer and I round that up to 200,000 words to simplify the math. That would mean Jim has written about 80,000 words and has about another 120,000 to go. If he got home from DragonCon on Monday Sept. 13, give him a day or two to recover so that takes us to Sept 15 before he starts writing again. There would be sixteen days left in September and twenty-seven days until his birthday, so a total of 43 days. However, I doubt that Jim writes seven days a week. Even if I only knock off three rest days that comes out to 40 days to write another 120,000 words for a pace of 3,000 words a day.
Jim has said that when he is really going strong he can write about 4,000 words a day, but I bet that high word rate is rare for him and doesn't last very long. Maybe a week at most. I think that for Jim to finish by this October 27th he would have prepared a major outline for this novel and already know how every remaining plot element will play out and end. This is something Jim hasn't done in the past, though he's talked about creating better outlines for future projects. I suppose it's possible, but it doesn't feel very realistic to me.
Then Jim hopes to finish Twelve Months; or the alternate tile of Twelve Dates, by the end of January. That's only three months writing time. Unless Jim already has a huge chunk of that novel already written, I don't see how he can do it. What feels far more realistic to me is Jim wants to finish the next Cinder Spires book before the end of January 2022 and the next Dresden book by his birthday on October 27 2022. That seems a more believable timetable to me.