如何从cron表达式中获取Java持续时间？

import org.quartz.CronExpression;
import org.quartz.CronTrigger;

import java.text.ParseException;
import java.time.Duration;
import java.time.LocalDateTime;

public class CronExpressionExample {
    public static void main(String[] args) {
        String cronExpression = "0 0 12 * * ?"; // 示例cron表达式

        try {
            CronExpression cron = new CronExpression(cronExpression);
            LocalDateTime now = LocalDateTime.now();
            LocalDateTime nextValidTime = cron.getNextValidTimeAfter(now);

            Duration duration = Duration.between(now, nextValidTime);
            long seconds = duration.getSeconds();
            long minutes = duration.toMinutes();
            long hours = duration.toHours();

            System.out.println("下一个满足cron表达式的时间点是：" + nextValidTime);
            System.out.println("持续时间为：" + seconds + "秒，或 " + minutes + "分钟，或 " + hours + "小时。");
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}