您要查找的是不是：
- 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 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 it since they met each other? 她们有多久没见面了?
- How long is it since they saw each other? 她们有多久没见面了?
- How long is it since we last went to the theatre? 我们多久没去看戏了?
- How long is it to circulate bottoms up? 需要循环多长时间?
- How long is it now to Lammastide? 从现在起到收获季节还有多久?
- How long is it since it was fitted? 您戴环多久了?
- How long is it since they see each other? 她们有多久没见面了?
- Then how about Pigsty B? How long is it? （老师：那么猪场B呢？它是多长？）
- How long is it since you were in Keelung? 你在基隆有多久了？
- How long is it after having a hilt installed on? 请问这个东西装上柄后大约有多长?
- How long is it now To Lammas-tide? 现在离开收获节还有多久。
- How long is it circulate bottoms up? 需要循环多长时间？
- How long is it to lunch? ie How much time is there until lunch? 离吃午饭还有多长时间?
- I'd like an open return ticket. How long is it good for? 我要一张回程日期空白的机票。它的效期多常?
- How long is it going to take before my massage sinks in? 我的想法被深刻理解将需要多长时间?
- The headmaster sets out to Pairs. How long is it by air? 校长明天动身去巴黎。乘飞机要多久能到?
- How long is it since the electronic computer came into use? 电子计算机开始应用到现在已有多久了?
- How long is it between the date of publication and the date of approval? 从公告那天起到核准那天止要多长时间?
