Hardcore by my definition, probably casual to core by yours.
I would say I'm hardcore, because of longevity, overal interest (mostly evident to you by me being on this forum) in everything surrounding gaming, and my diversity of games I'll play. I don't really care where something's released and what genre it is if it looks like something I'll like. Long story short, I'd play any sort of game, and have played any sort of game on any sort of platform. I also go back and forth between any generation no matter how old to play games, including ones I had missed two decades ago.
I find playtime to be less important. I wouldn't consider someone who solely plays World of Warcraft and nothing else a hardcore gamer, even if he played it 10 hours a day. Gameplay-style is also not really important, much less the divisions of realistic/cartoony or all-ages/mature; you could play any type of game both casually or hardcore. For example I play most RPG's or fighters very casually, because I don't care to learn deeper techniques and functions. I don't go for Platinum Trophies and whatnot either. I do however still play a couple games around 15 years old weekly still, and can by now make things with them most others could only dream about.
So I don't actually play that many in gross hours, but I have a very wide and longstanding interest and a wide collection. And that's hardcore to me.