Initiated devotees within the Krishna consciousness movement vow to chant a minimum quota of the Hare Krishna mantra each day on beads. They also take vows to avoid 1) intoxication, 2) illicit sex, 3) meat eating, and 4) gambling. These are commonly known as the “four regulative principles.”
Anyone can chant anywhere and anytime and get spiritual benefit. At the same time, mantras are more potent when received from a teacher and chanted as part of a process of self-purification. All formal training requires discipline. When we chant the Hare Krishna mantra while avoiding things that intensify our material illusion, we can more easily experience our natural spiritual consciousness.