Learning Japanese is great and it'll help you remember a handful of the kanji you've been studying. However, time management becomes a major pain in the ass, so please keep that in mind.
It's been about 70 days since I started doing both RTK and Genki from scratch. So far, I've added 1362 kanji and gotten to the beginning of chapter 18 of Genki, but I've been studying Japanese pretty much full time, except for the past week maybe. What happened is, my daily Anki reviews became a little too time consuming once I got to 1000 kanji. I ended up making a thread here to ask what I should do and ended up taking a break from RTK to lower my reviews while focusing mostly on Genki.
I've been adding a whole bunch of kanji out of order since then. I usually see what Genki teaches in the kanji/reading lessons, although they kind of suck in that for some stupid reason decided you should learn kanji for stuff you don't even use in the lessons and vocabulary that you haven't been taught yet. Anyway, whenever I add these kanji I try to add a handful of other related kanji including the new primitives I learn. I also add some interesting kanji that I stumble upon and feel like learning.
Now, the issue here is that doing Genki requires you to keep going. Daily contact with a language is key to learning it efficiently. Just like you shouldn't ditch your daily SRS reviews for the time, I recommend at the very least reviewing the audio exercises of the current lesson you're in if you can't move forward with Genki. That's going to help your brain adapt to the new language you're learning far more efficiently than cramming it for a day and skipping a few days. It's like working out - you won't get good results if you exercise once or twice a week.
One thing you could do to make things less of pain is look up all the kanji you're expected to learn in the reading sections of Genki 1 and 2. Then see if there's anything in the N5 - N4 list that you're missing. Learning these primitives beforehand and adding a whole bunch of kanji related to them would definitely help you do Genki efficiently. You could obviously just do that for Genki 1 at first, and then add the Genki 2 ones once you're done, but I think doing everything now might help you keep the momentum.
Oh wait, you said you can only study 2 hours a day. I definitely recommend adding everything from the reading section now then. Going through Genki while doing RTK and daily reviews is probably a little too much, unless you can keep your reviews + add a handful of kanji within an hour, which is pretty unlikely. I could be wrong, but I think you'll have to take a break from RTK to do Genki efficiently... unless you don't mind going through Genki very slowly. It's really up to you though. Genki is much more motivating than RTK, so I recommend doing it but you'll end up taking a break from RTK imo

. If you get most of these kanji you're expected to learn out of the way though, it's okay to take a break since you won't need that many kanji in Genki. Then you can get back to it once you're about to go from Genki 2 to Tobira or whatever.
Maybe you can even do some extra work in advance, say, another full week of RTK before adding Genki related kanji... that'll be helpful once you're done with Genki, because if you're like me then you'll probably want to be done with RTK as soon as possible. Having 700 kanji or less to go through by then will probably be a relief. All I can think right now is how many kanji I'll still have to add once I finish Genki 2.
Edited: 2015-11-23, 10:45 pm