BCov from Salt Lake City on 05/10/2018 04:54 PM:
From the research I have done, the Carstens Cottages are near Dumont which is about 15 miles out of Deadwood and about 31 miles from Hill City. My plan is to just do the 15 miles on the first day, because it is mostly uphill (1,700 elevation increase) and I am riding the trail with my family (wife and 3 kids). The second day will be the 31 miles into Hill City.
All of this information is just from my research, as we leave for the trip in a few weeks. I hope I'm not wrong!