What a great question! All that you need to do is sit quietly each day for 5 minutes and think about how you and God are the same.
Now that would be the minimum practice. You can certainly practice in whatever way you desire, for as long as you want, and in however complex form, but spirituality is more about coming to the awareness that you are not seperate from all that is Divine. Think of God as Life, and that there is only one life everywhere all the time. Since this Life is everywhere it is the very Life you are living, because you are not seperate from It! And since it is the Life you are living, then you are a part of It already.
You are a drop in the ocean of God now... and there is nothing you need to do in order to "gain" spirituality. You are already a spiritual being having a human experience.