By performing congregational chanting of Hare Krishna mantra, one can destroy the sinful condition of material existence, purify the unclean heart and awaken all varieties of devotional service.
Chant the mahamantra loudly and with attachment. This will drive away inertia, worldly evils and pests.
The morning section of the day is the foundation for the rest of the day and is considered the best time for bhakti. A businessman earns maximum profit when he runs his business during this period. Our business, as devotees, is to chant Hare Krishna and to attain Lord’s maximum mercy, thus, we should chant in the morning.
One achieves bhakti [love of God] by hearing and chanting about the Supreme Lord's special qualities, even while engaged in the ordinary activities of life in this world.
Yoga means to connect ourself again with God, or Krishna. This practice of yoga, always thinking of Krishna, is very easily accomplished by chanting Hare Krishna maha-mantra, if you chant Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare, Hare Rama, Hare Rama, Rama Rama, Hare Hare. Twenty-four hours it can be practiced. There is no expenditure, there is no loss, but the gain is very great.
From a lecture by Srila Prabhupada, Bhagavad-gita 7.1 — Durban, October 9, 1975
If one wants to achieve success at the end of his life, the process of remembering Krishna is essential. Therefore one should constantly/incessantly chant the Maha Mantra.