This library is made to figure out elapsed time. Such as: "has 30 minutes elapsed so I can refresh this authentication token?"
composer require chancegarcia/php-time-elapsed
<?php
...
$start = new \DateTime("2017-01-01");
$end = clone $start;
$end->modify("+1 hour");
$diff = $start->diff($end);
$service = new TimeElapsedService($diff);
$service->hasMinutesElapsed(20); // true
$service->hasTimeElapsed(1, 'minute'); // true
$service->hasTimeElapsed(20, 'minutes'); // true
$service->hasMinutesElapsed(90) // false
$service->hasTimeElapsed(90, 'minutes'); // false