The state requirement for CNA classes is that they be 75 hours. 10 days at 7.5 hours/day = 75 hours. Also, 16 of those hours have to be clinical hours.
I am not sure where you are located. I took my CNA class through BCTC in Lexington and I hada great experience. I learned everything I needed to ace the state test. Most of the actual CNA work is learned on the job.
I know people that have gone to other CNA programs, the schools
that only teach CNA classes and charge like $500 for it, and those students didn't feel prepared for the state test.
If I were you, I'd take it through a local community college, if possible.
Good luck! It's not hard, mostly common sense and memorization!