When I repaired my friends CVT, I reused the motor mount nuts but I also used blue Loctite to ensure they would not come loose. It has been a year now and nearly 10 K miles and everything is still good. As far as time to do the job, I spent a little over 20 hours and took my time. If I were doing that CVT rebuild again, I think I could do the entire job in 14 or 15 hours not that I want to do it again.