The main occupation of a devotee of Krishna is chanting Hare Krishna. For a devotee chanting Hare Krishna is like breathing. Without breathing we can not live and without chanting Hare Krishna we can not be Krishna conscious. So whenever you see a devotee you will see that he is chanting Hare Krishna. Always. 24 hours a day. This would not be possible unless there was some incredible transcendental ecstasy in the Hare Krishna maha-mantra.