Yes, I also did their RN-BSN program back in 2013 and It was also a great program. Both programs offered 5 week courses, however only one class can be taken at a time, unless approved by the academic advisor. The hardest class to me in the RN-BSN program was Research. The easiest class was probably medical terminology
. Both programs are very APA writing-intensive, with the MSN program being at a much higher level, with heavy research involved.
For the RN-BSN program I started off working full time, but then I had a baby and scaled down to PRN. It took me one year to finish; this included some doubling/tripling of classes. My MSN took me a lot longer though, I started in 2014 while pregnant with my second child, and obviously took quite a few breaks to help balance my personal and professional life (I worked full time 3 of the 4 years).
In in regards to the CNE exam, I have not taken that yet. I am planning on taking it next month, and I do feel prepared to take it because one of the required books for the last course (Practicum) was a CNE review book. I hope this answers most/all your questions.