GatherPress Duration Options (Test)

gatherpress-duration-options.php

<?php
/**
 * Plugin Name: GatherPress Duration Options
 * Description: Adds custom duration options to the GatherPress plugin using the durationOptions filter.
 * Version: 1.0
 * Author: Mike Auteri
 * License: GPL2+
 */

 defined( 'ABSPATH' ) || exit;

 add_action( 'admin_print_footer_scripts', 'gatherpress_duration_options_inline_script', 100 );

 function gatherpress_duration_options_inline_script() {
	 // Only load on block editor screens
	 $screen = get_current_screen();
	 if ( ! method_exists( $screen, 'is_block_editor' ) || ! $screen->is_block_editor() ) {
		 return;
	 }
	 ?>
	 <script>
		 (function () {
			 if ( typeof wp === 'undefined' || ! wp.hooks ) return;

			 wp.hooks.addFilter(
				 'gatherpress.durationOptions',
				 'gatherpress/durationOptionsTest',
				 function ( options ) {
					 return [
						 {
							 label: '2 hours',
							 value: 2,
						 },
						 {
							 label: '10 hours',
							 value: 10,
						 },
						 {
							 label: 'Set an end time...',
							 value: false,
						 },
					 ];
				 }
			 );
		 })();
	 </script>
	 <?php
 }

Add this file to plugins in your WordPress installation and activate to test duration option filter.