Yeah, I have a full time job that's exhausting, so I don't practice for hours a day. I usually get at least half an hour in every day, some times a lot more, some times I don't practice at all. This is what works for me. I tried setting down a schedule at one point, when I was reading through RRTCM. I would come home from work, spend an hour or so eating and relaxing, then grab the book and the cards and go over something for an hour or two. I started getting really bored with it.
Now what I do is this: I put on something to watch, something I've already seen and can watch without really having to pay attention to. I practice various sleights for a while. Whatever I'm currently working on. Then I run through and do whatever sleights I can think of, just to keep them fresh in my mind. Then I run through some routines. I've got an ACR that I rather like, another simple three-trick routine, etc. After that I run through various tricks I'm working on, like Diplopia, Revolution No. 9, Search and Destroy, and so on. If I'm in the mood for it, I'll do some coin work as well, and I'll frequently run through some other stuff with rings, watches or whatever.
I may only get to practicing one sleight, or I may run through all of that, depending on the amount of time I have and what I feel like doing. I have, however, started trying to keep a journal about my performances and what I need to work on in practice.
To some people this would be a horribly unorganized way to practice, but I've made a lot of improvement since switching to this freestyle method. I work on what's interesting, which makes me want to keep working on stuff.
So my advice would be to just try different methods and techniques. I do recommend having a good mirror and a video camera whenever possible. Watching yourself from the spectator's point of view will tell you so much more than trying to imagine what it looks like from over there.