How many times do you do your ten minute reality check during the day? Also, you could consider this: how much awareness does it take you to normally become lucid in a dream? If all you really need to do is "become aware" in the sense of becoming aware of where you are, what you are doing, and why you are doing it, you may not need to spend ten minutes on one reality check. For the sake of saving time, I would suggest becoming aware of yourself and your environment, ask whether or not it is possible you are dreaming, and then perform a reality check. And if you find that you become lucid often without RCing, then (as Chewnie is suggesting) you may have found a better way to RC.