functions.php

<?php

/**
 * Shared Counts update increments
 * @see https://sharedcountsplugin.com/2019/03/27/change-how-often-share-counts-refresh/
 */
function be_shared_counts_update_increments( $increments ) {
	return array(
		array(
			'post_date' => strtotime( '-2 days' ),
			'increment' => strtotime( '-15 minutes' ),
		),
		array(
			'post_date' => strtotime( '-7 days' ),
			'increment' => strtotime( '-6 hours' ),
		),
		array(
			'post_date' => 0,
			'increment' => strtotime( '-3 days' ),
		),
	);
}
add_filter( 'shared_counts_update_increments', 'be_shared_counts_update_increments' );