Duration or time elapsed formatter using moment js (i.e 34 hours and 5 minutes, 1 hour 1 minute)

duration.ts

function getDuration(startTime: Date, endTime: Date): string {
	const milliseconds = moment(endTime).diff(startTime);
	const duration = moment.duration(milliseconds);
	const durationAsHours: number = Math.floor(duration.asHours());
	const restInMinutes: number = duration.minutes();
	const hours: string =
		durationAsHours > 1
			? `${durationAsHours} hours and `
			: durationAsHours > 0
				? `${durationAsHours} hour and `
				: '';
	const minutes: string = restInMinutes === 1
		? `${restInMinutes} minute`
		: `${restInMinutes} minutes`;
	// if less than 1 minute show just the seconds
	const minutesOrSeconds = milliseconds >= 60000
		? minutes
		: `${moment.duration(milliseconds).seconds()} seconds`;
	return `${hours}${minutesOrSeconds}`;
}


	/*
Reference: https://stackoverflow.com/questions/18623783/get-the-time-difference-between-two-datetimes?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
	*/