1. Decide on the period in which you will be able to meditate every day.
20 minuutes is a minimum to be effective. If you think you will manage 30 minutes, great – every day. And if you are seriously serious, you might find that you could meditate for an hour a day.
2. What about if you miss?
Ok, we know that everyone misses once in a while, just as once in a while you might miss lunch. Missing lunch makes you very hungry for nutrition, and in missing meditation your hunger for deep change goes unsatisfied. Keeping a steady practice trains the mind to a) have some discipline and focus, and b) become so still that eventually you see how your mind works in creating your sense of self.
3. How will I know when my meditation time is finished?
Set an alarm. Phones are wonderful time-keepers. Set it for the exact time, whether 20, 30 or 60 minutes, and DO NOT GET UP UNTIL THE FULL TIME HAS ELAPSED. If you are fidgety, just watch the mind wanting to escape. And continue till the bell rings.