Actually one has to chant twenty-four hours daily, just like Thakura Haridasa, who was chanting the Hare Krsna mantra three hundred thousand times daily. Indeed, he had no other business
SB Canto 4
Therefore, O sons of the King, the Supreme Personality of Godhead, Hari, is situated in everyone's heart. He is also within your hearts. Therefore chant the glories of the Lord and always meditate upon Him continuously.
The word asakṛt is significant, for it means not just for a few minutes but continuously. That is the instruction given by Lord Caitanya Mahāprabhu in His Śikṣāṣṭaka 3. Kīrtanīyaḥ sadā hariḥ: (CC Adi 17.31) "The holy name of the Lord should be chanted twenty-four hours daily." Therefore in this Kṛṣṇa consciousness movement we request the devotees to chant at least sixteen rounds on their beads daily. Actually one has to chant twenty-four hours daily, just like Ṭhākura Haridāsa, who was chanting the Hare Kṛṣṇa mantra three hundred thousand times daily. Indeed, he had no other business. Some of the Gosvāmīs, like Raghunātha dāsa Gosvāmī, were also chanting very rigidly and also offering obeisances very rigidly. As stated in Śrīnivāsācārya's prayer to the six Gosvāmīs (Ṣaḍ-gosvāmy-aṣṭaka): saṅkhyā-pūrvaka-nāma-gāna-natibhiḥ kālāvasānī-kṛtau. The word saṅkhyā-pūrvaka means "maintaining a numerical strength." Not only was Raghunātha dāsa Gosvāmī chanting the holy name of the Lord, but he was also offering obeisances in the same prolific numbers.
Because the princes were ready to enter into some severe austerity in order to worship the Lord, Lord Śiva advised them to constantly chant of and meditate upon the Supreme Personality of Godhead. It is significant that Lord Śiva personally offered his prayers to the Supreme Personality of Godhead just as he was taught by his father, Lord Brahmā. Similarly, he was also preaching to the princes according to the paramparā system. One not only should practice the instructions received from the spiritual master but should also distribute this knowledge to one's disciples.
The words ātmānam ātma-sthaṁ sarva-bhūteṣv avasthitam are also significant. The Personality of Godhead is the origin of all living entities. Because the living entities are parts and parcels of the Lord, He is the father of all of them. One can search out the Supreme Lord very easily within one's heart, for He is situated in every living entity's heart. In this verse the process of worshiping the Lord is considered to be very easy and complete, for anyone can sit down anywhere and in any condition of life and simply chant the holy names of the Lord. By chanting and hearing, one automatically engages in meditation.