I've read that people usually end up having 80+ hours for the first playthrough so it seems you finished it quite quickly?
Also just read that there's a Persona 5 coming out this year for PS4! Had no idea, great news
Yeah, it was quick and everyone was telling me that at the time. It might have been slightly more but definitely nowhere near 80. I always take ages to finish games normally.
Persona 5 is Q3 in Japan and Q4 in America. Not clear if they are going to release it in Europe by the end of year but you could just download from the US Store or import.