We may not be able to follow this instruction perfectly straight away, but this is what we should be aiming for if we want to become happy:
«As a matter of principle, devotees should read, speak and hear Śrīmad-Bhāgavatam persistently, twenty-four hours daily if possible. That is the recommendation of Śrī Caitanya Mahāprabhu. Kīrtanīyaḥ sadā hariḥ. One should either chant the Hare Kṛṣṇa mahā-mantra or read Śrīmad-Bhāgavatam and thereby try to understand the characteristics and instructions of the Supreme Lord, who appeared as Lord Ṛṣabhadeva, Lord Kapila and Lord Kṛṣṇa. In this way one can become fully aware of the transcendental nature of the Supreme Personality of Godhead. «
SB 5.6.16 purport