bbp_get_topic_last_active_time( int $topic_id )

	function bbp_get_topic_last_active_time( $topic_id = 0 ) {
		$topic_id = bbp_get_topic_id( $topic_id );

		// Try to get the most accurate freshness time possible
		$last_active = get_post_meta( $topic_id, '_bbp_last_active_time', true );
		if ( empty( $last_active ) ) {
			$reply_id = bbp_get_topic_last_reply_id( $topic_id );
			if ( !empty( $reply_id ) ) {
				$last_active = get_post_field( 'post_date', $reply_id );
			} else {
				$last_active = get_post_field( 'post_date', $topic_id );
			}
		}

		$last_active = !empty( $last_active ) ? bbp_get_time_since( bbp_convert_date( $last_active ) ) : '';

		// Return the time since
		return apply_filters( 'bbp_get_topic_last_active', $last_active, $topic_id );
	}