diff --git a/src/registry.js b/src/registry.js
index 8a185065e..679e54f15 100644
--- a/src/registry.js
+++ b/src/registry.js
@@ -352,6 +352,7 @@ class CommandoRegistry {
 	 * @param {boolean} [types.categoryChannel=true] - Whether to register the built-in category-channel type
 	 * @param {boolean} [types.message=true] - Whether to register the built-in message type
 	 * @param {boolean} [types.customEmoji=true] - Whether to register the built-in custom-emoji type
+	 * @param {boolean} [types.duration=true] - Whether to register the built-in duration type
 	 * @param {boolean} [types.command=true] - Whether to register the built-in command type
 	 * @param {boolean} [types.group=true] - Whether to register the built-in group type
 	 * @return {CommandoRegistry}
@@ -361,7 +362,7 @@ class CommandoRegistry {
 			string: true, integer: true, float: true, boolean: true,
 			user: true, member: true, role: true, channel: true, textChannel: true,
 			voiceChannel: true, categoryChannel: true, message: true, customEmoji: true,
-			command: true, group: true, ...types
+			duration: true, command: true, group: true, ...types
 		};
 		if(types.string) this.registerType(require('./types/string'));
 		if(types.integer) this.registerType(require('./types/integer'));
@@ -376,6 +377,7 @@ class CommandoRegistry {
 		if(types.categoryChannel) this.registerType(require('./types/category-channel'));
 		if(types.message) this.registerType(require('./types/message'));
 		if(types.customEmoji) this.registerType(require('./types/custom-emoji'));
+		if(types.duration) this.registerType(require('./types/duration'));
 		if(types.command) this.registerType(require('./types/command'));
 		if(types.group) this.registerType(require('./types/group'));
 		return this;
diff --git a/src/types/duration.js b/src/types/duration.js
new file mode 100644
index 000000000..785b7d770
--- /dev/null
+++ b/src/types/duration.js
@@ -0,0 +1,70 @@
+const ArgumentType = require('./base');
+
+class DurationArgumentType extends ArgumentType {
+	// This.duration::Milliseconds
+	constructor(client) {
+		super(client, 'duration');
+		this.timeIds = new Set(['mo', 'w', 'd', 'h', 'm', 's', 'ms']);
+		this.duration = 0;
+	}
+
+	// Confirms match before continuing.
+	// Checks if matched number is an int.
+	// Checks if matched string is in expected set.
+	validate(value) {
+		const MATCHES_ALL = value.match(/(\d+)\s*([A-Za-z]+)/g);
+
+		for(let i = 0; i < MATCHES_ALL.length; i++) {
+			const tempNum = MATCHES_ALL[i].match(/(\d+)/g);
+			const tempStr = MATCHES_ALL[i].match(/([A-Za-z]+)/g);
+			if(!tempNum || (tempNum.length !== 1)) return false;
+			if(!tempStr || (tempStr.length !== 1)) return false;
+			if(!Number.isInteger(parseInt(tempNum[0])))	return false;
+			if(!this.timeIds.has(tempStr[0])) return false;
+		}
+		return true;
+	}
+
+	// Separate each time group (Xmo, Yw, Zd, ext.)
+	// Combine to a single time value (in milliseconds)
+	// Return time value unless null
+	parse(value) {
+		const MATCHES_ALL = value.match(/(\d+)\s*([A-Za-z]+)/g);
+		let totalTime = 0;
+		MATCHES_ALL.forEach(dur => {
+			const tempNum = parseInt(dur.match(/(\d+)/g)[0]);
+			const tempStr = dur.match(/([A-Za-z]+)/g)[0];
+			if(isNaN(tempNum)) totalTime = null;
+			else totalTime += tempNum * determineTimeType(tempStr);
+		});
+		if(totalTime !== null) {
+			this.duration = totalTime;
+			return this.duration;
+		} else {
+			return null;
+		}
+	}
+}
+
+function determineTimeType(str) {
+	switch(str) {
+		case 'mo':
+			return 30 * 24 * 60 * 60 * 1000;
+		case 'w':
+			return 7 * 24 * 60 * 60 * 1000;
+		case 'd':
+			return 24 * 60 * 60 * 1000;
+		case 'h':
+			return 60 * 60 * 1000;
+		case 'm':
+			return 60 * 1000;
+		case 's':
+			return 1000;
+		case 'ms':
+			return 1;
+		default:
+			return null;
+	}
+}
+
+module.exports = DurationArgumentType;