My character detailed statistics indicate a play time of 17 days and 1 hour. I'm only level 18 though and currently going through the The Play's the Thing. Most of the sidequests I've done (including contracts and whatnot) are lower in level than the main quest. Didn't even touch Skellige yet. First playthrough.
I did try to savour the game during the limited play time I had since May. A few rules I imposed on myself which probably contributed a lot to the inflated play time: never used fast travel, always returned the boats to their original location (the exception is the one boat I managed to sink recently), always returned to where I left my horse (only used to call her when the game despawned her, never had Roach miraculously teleport at my side), walked as much as possible (having a white hair dude jogging through the streets of Novigrad just seems weird). The game world is just so beautiful that sometimes my play session consists of merely traveling from one area to another to pick up a quest and watching the scenery.
I did try to savour the game during the limited play time I had since May. A few rules I imposed on myself which probably contributed a lot to the inflated play time: never used fast travel, always returned the boats to their original location (the exception is the one boat I managed to sink recently), always returned to where I left my horse (only used to call her when the game despawned her, never had Roach miraculously teleport at my side), walked as much as possible (having a white hair dude jogging through the streets of Novigrad just seems weird). The game world is just so beautiful that sometimes my play session consists of merely traveling from one area to another to pick up a quest and watching the scenery.