The number of hours spent in meditation is no proof of spiritual progress. It is a proof of your progress when you no longer have to make an effort to meditate. Then you have rather to make an effort to stop meditating: it becomes difficult to stop meditation, difficult to stop thinking of the Divine, difficult to come down to the ordinary consciousness. Then you are sure of progress, then you have made real progress when concentration in the Divine is the necessity of your life, when you cannot do without it, when it continues naturally from morning to night whatever you may be engaged in doing. Whether you sit down to meditation or go about and do things and work, what is required of you is consciousness; that is the one need,—to be constantly conscious of the Divine.
Ref: Questions and Answers 1929-1931