I put in like.. 4-5 hours a day at work (ALT in Japan, so most probably know how that goes). This is almost purely doing reps/learning grammar/writing stuff, as I have no internet connection and no other distractions beside my netbook with no apps besides Anki and a few other essential, not-so-fun utilities. I've a few grammar books (Basic Connections, Effective Japanese Usage Dictionary, and Dictionary of Japanese Particles are the three I use the most right now) that I generally browse through and create Anki cards with.
Anyways, my job actually created this pretty incredible situation where I study to make the day go by faster, keeping my motivation pretty high. Much better than just hanging out and doing nothing at my desk for the 60-70% of the time I'm at my job with nothing to do.
Every morning when I wake up, I try to spend 30-40 minutes before I leave doing Anki reps. This is sorta like a game, where I race to see how many I can do before I have to leave my house. I like to hit work with no reps to do (as I also clear them before I go to sleep). Then I just keep up on them throughout the day.
To and from work (a 10 minute walk, 10-15 minute wait at the bus station, and 40 minute bus ride in a comfortable express bus) - during this time, I usually have the headphones in listening to podcasts while reading some Manga or other (slogging through Death Note). I usually just highlight words I don't know for review later (with a highlighter, my manga are all pretty ugly now. heh) and keep moving along, as writing on the bus is difficult and I don't have a portable dictionary... I usually read the same comic a few times. Peel back the layers of understanding, like an onion.
Also these days, I've been ripping audio from some anime and then printing out the transcriptions (namely, Cowboy Bebop right now) and listening to it during my commute while reading it.
When I get home, I usually start up my media player which'll kick a random anime (usually from Samurai Champloo, Cowboy Bebop, Death Note - repetition, repetition, repetition... onions, onions, onions.)
While that's rolling, I like to browse Japanese websites a lot. Some examples:
Yahoo! 知恵袋,
Yahoo! MLB,
コトノハ. English invades my life here as I get sucked into the English internet (i.e. this site, e-mailing, some Facebooking, and people pestering me up on GoogleTalk). I like to keep Anki open and do 10-15 reviews every once in a while, but don't really put any pressure on myself to do this. If I don't feel like it, I know that the next morning I'll hit it hard again before I go to the school and there's always time to catch up there. It's that no-pressure atmosphere that really has been motivating for me - I don't HAVE to study, so I feel like studying. heh..
Usually I'll be inputting some stuff into Anki while I'm going about this.. just if something catches my eye, or whatever.
Mostly, I don't put any restrictions on myself at all while I'm at home. If I feel like doing nothing, I do nothing... again, it's this no pressure atmosphere that leads me right back to wanting to study Japanese instead of zoning out to an English movie or something. That's actually a lie - I've banned completely English television. American TV these days has too many quality shows that will literally suck HOURS UPON HOURS out of your life if you're not careful.

I can name off so many shows that, while really entertaining, I really wish I had those hours back. heh...
Scattered throughout this are my daily interactions, which I try to keep as much in Japanese as possible. Some teachers I work with use me for English practice, which is alright, though I've no foreign friends here so that really cuts down on the "recreational" English I use... I haven't really talked to a native speaker in person in about a month. heh...
I've only been at this pace for maybe 3 months (well, really in the beginning it was less though it kinda ramped up to this pace over the first month). That's when I moved to this area and took this job. Before this, I worked at a conversation school for about a year - which filled my days with many classes, kinda fried my brain, and sapped my will to live/learn Japanese.

My studying time then was like 1-2 hours a day, apart from the whole "living in Japan" thing.
Obviously, I've seen huge improvements. I did RTK1 and about another 500 Kanji I felt were useful in a few months, wrote up a kanji town/chain like onyomi mnemonic system, while still keeping good pace on my grammar/vocab studies. Before this sorta "phase" of my life started, as ridiculous as that sounds, I felt like the "year" of studying I'd done was sorta a waste. It felt like Japanese wasn't quite possible. RtK helped with that a lot, I think.
It's also worth noting that I spoke zero Japanese before I came to Japan about a year and a half ago. And I feel like I spent about half that time just learning HOW to study a language. heh...
This all said, I'm still really self conscious speaking Japanese (when not drinking...heh. quite the opposite after a few beers). Honestly, I'm overly concerned about making mistakes and looking stupid. That's a difficult hurdle.

And I don't speak Japanese to people who can speak English better than I can speak Japanese. It just doesn't make sense. heh...
I don't really feel obsessed, though. There's just not much better to do and I'm pretty entertained by it. I'm not really pushing myself at all (except for maybe my early morning reps), which had the opposite effect I think most people might experience and increased my studying. I guess it's because it doesn't feel like studying, just hanging out and doing whatever I want (which just happens to be learning a little Japanese).
Anyways, some "total count" of hours put into it seems kind of impossible to guess. I'll say, I put a very good portion of each day into it. heh...
Sorry for the long, wandering post... and hello everyone.
Edited: Changed "I did RTK1 and about another 1000 Kanji" to "I did RTK1 and about another 500 Kanji." I actually chose not to do RtK3 and just added some high frequency Kanji and then some that keep popping up in places. I just guestimated the amount of Kanji I learned but upon rereading I realized that would've brought me up to "finished RtK3" level, which I haven't done. So I looked at my deck and sure enough, I only had about 500 over RtK1. Oops