My save is currently 61 hours and starting to feel the same. I've had a blast, and still really enjoying it, but at the 50 hour mark I finally started fast travelling because I'm feeling like it's time to wrap things up. I'm sitting on about 4 or 5 broken quests that I can't finish and I looked up the main quests to see how far I am and I'm only about half way. Surely I'm nearly done with all the side quests anyway so I may not have any choice other than blitzing through the story.Basically hit a wall after 50 hours and just mainlined the story for the last 25 hours. Ended up being largely frustrated with the amount of fetching and investigating and just wanted to end the game.
I still very much enjoyed it though and will definitely come back for another playthrough in a year or so once the DLC is out and they've cleaned the game up. It has some fantastic ideas and i genuinely believe the combat is the best in an RPG in years. Ultimately the bugs ruin the experience though as, has been mentioned before, you've got to step lightly with every quest as there's more than likely going to be a quest breaking bug at some point to ruin it. I ended up with a bunch of unfinished quests even after 1.3 which is a shame, not that i had much want to play them anymore anyway.
END GAME SPOILERS:
Game ended pretty abruptly as well which was strange but i loved the last few set piece battles, felt like a proper fight. I thought Radzig would turn out to be bad but that never eventuated, at least not yet. Probably won't get the DLC straight away when it drops and i'd personally prefer they clean the game up before then because this is a mess.
What I've loved about this game is the way to finish a mission isn't always written down. You can open the journal and map and see what it tells you to do but you can be like "no way, I'm going to snitch this guy instead" or "I've got a hunch about something and I'm going to go there instead" and plenty of times that works. One quest was so fragile though that I told the NPC "I'll think about it" as I wanted to explore other options but upon returning to that NPC he never triggers the quest ever again. It's little things like that which really take the shine on an otherwise awesome experience.