Channel Divinity (3/rest) is a Cleric feature gained at level 18 in D&D 5e. Beginning at 6th level, you can use your Channel Divinity twice between rests, and beginning at 18th level, you can use it three times between rests.
Beginning at 6th level, you can use your Channel Divinity twice between rests, and beginning at 18th level, you can use it three times between rests. When you finish a short or long rest, you regain your expended uses.