The holy name of the Lord should be chanted twenty-four hours daily.
Srimad Bhagavatam 4.24.70,
One can purify the mind by the chanting process, just as one can purify gold by putting it in a fire and fanning it with a bellows.
Srimad Bhagavatam 3.28.10,
Only way to control the mind, is to neglect the dictation of the mind & always Chant Holy Names of the Lord.
In this age, therefore, the only practical yajna is sankirtana-yajna, or chanting of the Hare Krishna mantra twenty-four hours a day.
Srimad Bhagavatam 4.13.25
Of sacriﬁces I am the chanting of the holy names [japa].
Bhagavat Gita 10.25