After a bit of a hiatus last week for obvious reasons, am getting back into it. I think I'm nearing end-game, am at level 31, all mutagen slots filled (with points to spare, may do some re-allocation), sporting a full set of mastercrafted Griffin gear (armor + swords), have finished *all* the witcher contracts, not much more than regular plot stuff now. Good story development, challenging fights (Irleith or whatever the hell that wild hunt general's name was), had to play that one several times before I managed to defeat him.
Damn this is a long game. I've clocked something like 140 hours, and am still on the first run-through and not even finished. Skyrim was probably more like 80 hours to finish the main plot line - though I did it with several characters so it adds up. Not sure Witcher 3 has quite the re-playability of Skyrim or other RPGs... we'll see.