pretty-ms with custom units https://github.com/sindresorhus/pretty-ms/

CustomPrettyMs.js

'use strict';
const parseMs = require('parse-ms');
const plur = require('plur');
const units = [{ s: 'y', l: 'year' },
	       { s: 'd', l: 'day' },
	       { s: 'h', l: 'hour' },
	       { s: 'm', l: 'minute' },
	       { s: 's', l: 'second' },
	       { s: 'ms', l: 'millisecond' }];

module.exports = (ms, opts) => {
	if (!Number.isFinite(ms)) {
		throw new TypeError('Expected a finite number');
	}

	opts = opts || {};
	if (!opt.units) opt.units = units;

	if (ms < 1000) {
		const msDecimalDigits = typeof opts.msDecimalDigits === 'number' ? opts.msDecimalDigits : 0;
		return (msDecimalDigits ? ms.toFixed(msDecimalDigits) : Math.ceil(ms)) + (opts.verbose ? ' ' + plur(opt.units[5].l, Math.ceil(ms)) : opt.units[5].s);
	}

	const ret = [];

	const add = (val, unit, valStr) => {
		if (val === 0) {
			return;
		}

		const postfix = opts.verbose ? ' ' + plur(unit.l, val) : unit.s;

		ret.push((valStr || val) + postfix);
	};

	const parsed = parseMs(ms);

	add(Math.trunc(parsed.days / 365), opt.units[0]);
	add(parsed.days % 365, opt.units[1]);
	add(parsed.hours, opt.units[2]);
	add(parsed.minutes, opt.units[3]);

	if (opts.compact) {
		add(parsed.seconds, 'second', 's');
		return '~' + ret[0];
	}

	const sec = ms / 1000 % 60;
	const secDecimalDigits = typeof opts.secDecimalDigits === 'number' ? opts.secDecimalDigits : 1;
	const secFixed = sec.toFixed(secDecimalDigits);
	const secStr = opts.keepDecimalsOnWholeSeconds ? secFixed : secFixed.replace(/\.0+$/, '');
	add(sec, opt.units[4], secStr);

	return ret.join(' ');
};