Helper to convert years, days, hours, minutes, seconds and milliseconds to smaller time units.
composer require steffenbrand/in-time
$a = 2 * Years::IN_DAYS; // 730
$b = 2 * Weeks::IN_DAYS; // 14
$c = 2 * Days::IN_HOURS; // 48
$d = 2 * Hours::IN_MINUTES; // 120
$e = 3 * Minutes::IN_SECONDS; // 180
$f = 2 * Seconds::IN_MILLISECONDS; // 2000
$g = 2 * Seconds::IN_MICROSECONDS; // 2000000