For me it was too long. I finished it with all the DLC for the first time a few days ago. I generally enjoyed it but was also quite happy to be done with it when I finally finished it at around the 110 hour mark. I actually took a break after Hearts of Stone and played a couple of shorter games before I came back to finish off Blood and Wine.
I haven’t yet played a single player game that I thought needed to be more than 60 hours no matter how engaging or well made it was.