Meditating whole day is neither advisable nor possible. Meditation is primarily a mental process, and at best and if truly done with persistence it may take us towards an impersonal peace.
... the seeking for physical immortality is not out of any personal desire but as part of the fulfillment of the grand design of the Divine for which the earth and body was made.
Nothing can be taught because knowledge does not exist outside but within us. What this means is that the Wisdom that has gone into the worlds is there within us as much as it is there within each atom of existence.
Our spiritual ascension does not need a companion, but since life has an inward and an outward movement, a companion at this stage can help through complementarity whereby one of the partner is more inward oriented while the other takes charge of the outward aspects.