做這項工作需要多長(cháng)時(shí)間？
How long will the job take?
你能估計其長(cháng)度[它有多長(cháng)]嗎？
Can you estimate its length/how long it is?
安裝電話(huà)機與總機接通要多長(cháng)時(shí)間？
How long will the connection of the telephone take? ie How long will it take to install a telephone and connect it to the exchange?
自從我們看望你母親以來(lái)到現在有多長(cháng)時(shí)間了？
How long is it since we visited your mother?
我回憶不起來(lái)多長(cháng)時(shí)間了。
I can't recall how long it has been.
你能瞪著(zhù)看多長(cháng)時(shí)間不眨眼？
How long can you stare without blinking your eyes?
到那兒要多長(cháng)時(shí)間？
How long will it take me to get there?
