Your absolute minimum is your own set needs which are different individually and you must discover by compounding your daily practice and study. As a beginner, meditation (trance, awareness) acknowledging the chakras (awareness - meditation, energy work), and cleaning are universally necessary for all.
All of the things that will help are of meditative quality so try to understand the nature of your focus and awareness, and how you use it.
Start mapping sensorially and in your mind the chakra system through meditation and the foundation meditation. From there on you add to your practice more and more from the Joy of Satan.
No one had exceptional results with the absolute minimum, they receive back what they put in. Meditation and awareness aren't bound by any material limit or circumstance, everyone can find 20 minutes to 2 hours during the day, time, to practice this, indiscriminately.