Warning: this ended up a little longer than I’d planned, but should still be comprehensive.
Generally speaking when it comes to RC’s it’s quality over quantity. You’ll want to make sure that when you do your reality checks that you really ask yourself the question: “Am I dreaming?”
And don’t just answer to yourself that you’re not. Genuinely ask yourself the question. Become aware of your surroundings. Take a good look around, listen to the sounds, rub your hands, touch something. Get all of your senses going for a bit. This should not need more than 10 seconds or so. THEN perform a RC, expecting it to work (i.e. try to imagine what would happen if you were dreaming).
With that in mind, I’d say that doing RC’s at random times during the day is best. I’d say try to do at least one every hour, but don’t use a timer to do them. Ten or twelve would be the minimum on a given day and more is better, but only if you do them properly.
If you spend 10-15 seconds per RC, and take a moment to become aware of yourself and your senses, then the RC will be that much more effective.
Another thing you could do, rather than determining that you’re going to check somewhat randomly, is to decide in advance when you’re going to perform the RC’s. This will get your prospective memory going, increasing your success rate with MILD, for instance. There are several ways to do this.
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You make a predetermined list of events and do an RC every time one such event comes up. For instance every time you see a dog, or every time you hear a car horn, or every time you wash your hands. You can make up any sort of minor event. A combination of a few that will likely result in at least 10 RC’s a day probably works best.
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You decide, on an individual RC basis, what the event is and when you’re going to RC. For example, you might go like… “In 20 minutes I’ll be at the mall and when I walk through the entrance I will ask myself if I’m dreaming.” You can decide a few in advance, or you can just decide on a new event after every RC.
If you use one of these last two, rather than the random RC’s (both work fine, TBH and you can do all of it, if you feel so inclined), it helps a lot if you picture yourself in the relevant events. This roots it in your memory quite strongly.
Whatever you end up doing, the RC’s combined in any given day will take you only 3 or 4 minutes (if you take 15 seconds per RC and do, for instance 12-16 like I do). And it should improve your chances of becoming lucid.
But it’s best if you still perform a technique such as MILD at night. When you wake up from a dream, take a moment to think about that dream, and imagine yourself becoming lucid in that dream, and performing a reality check. Then simply allow yourself to fall asleep again, whilst intending to become lucid in your next dream (keep this thought going for as long as possible until it’s the last thing you think about before falling asleep).