I have realized the practice is not confined to how much time one spends in a given place, office or home, or how many hours one sits by the telephone waiting for a call. Without the true sense of availability, one could sit by the phone for hours and not hear it ring.
Availability, to my sense, begins with our individual availability to the Christ. Christ answers before the call. If we are available to us. The calls will come at the right time no matter where we are.
In The First Church of Christ, Scientist, and Miscellany, page 353, Mrs. Eddy speaks of the "universal activity and availability of Truth" in regard to The Herald of Christian Science. Christian Science practice is the expression of the universal activity and availability of Truth. So one's avaliability in this work is unlimited—never subject to one place. No matter where we are or what we are doing, at work, at home, or at play, we are never separated from Christ.