您要查找的是不是：
- How long is this ticket available (valid for)? 这票有效期是多长时间?
- How long is this ticket valid? 这张票的有效期是多久？
- How long is this ticket available ? 这票的有效期是几天?
- By the way,how long is the ticket valid? 顺便问一下，车票的有效期是几天?
- By the way, how long is the ticket valid? 外宾: 顺便问一下，车票的有效期是几天?
- How long is this flight going to be delayed? 这班飞机还会延迟多久？
- How long is this distance of scene? 这一幕距离现在有多久的时间了?
- How long is this ice box guaranteed? 这台冰箱的保修期是多长?
- Fry: Man, how long is this gonna take? 要多久才能进的去啊?
- How long is the ticket valid? 这车票有效期多久?
- How long is the post tenable for? 这个职位任期多长？
- How long is the ticket available? 这些车票的有效期有多长？
- How long is a student visa valid for? 学生签证的有效期限?
- How long is it since we visited your mother? 自从我们看望你母亲以来到现在有多长时间了？
- How much longer is this going to drag on? 这事还要拖多久?
- Q. How long is my certification valid? 问：我的认证有效期有多久?
- How long is a return ticket good for? 来回票可有效多久?
- How long is the warranty on this machine? 这部机器的保证期有多久?
- How long is it since the electric computer came into use? 电子计算机开始应用到现在已有多久了？
- How long is this line? 这线有多长？
