Q1. Is liberation for ever? or does it have a definite time period?
Q2. How can we connect consciously with our subconscious mind?
Once the soul attains liberation, then it is, indeed, for eternity.
As for connecting with the subconscious — a much more important need is to connect with the superconscious. The goal of life is to raise our awareness to the superconscious, which then lifts both the subconscious and conscious mind. This is where the science of meditation comes into being a crucial approach for our spiritual growth.
In reality we should look at how, we in effect, “re-program” the subconscious, so it supports our journey of Self-realization towards enlightenment and liberation. Otherwise the subconscious can easily take us off course with wrong habits and thought patterns.
We can use a number of ways to gain the support of the subconscious thoughts and habits. One way is to always have positive thoughts and to perform good actions. We should also be sure that we refuse to feed the subconscious any further bad thoughts and actions.
My suggestion is to work with deepening your meditation practice, and then live more with God’s presence guiding you through all your feelings, thoughts and actions.
I would also recommend that you read and study Swami Kriyananda’s book, Awaken to Superconsciousness.
Blessings on your spiritual journey,