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ADV-GRADED
长时间的；长久的；长期的
Long means a great amount of time or for a great amount of time.
例句
Repairs to the cable did not take too long...
电缆的维修没有花太长的时间。
Have you known her parents long?...
你认识她父母很长时间了吗？
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ADJ-GRADED
（事件或时期）持续时间长的，花长时间的
A long event or period of time lasts for a great amount of time or takes a great amount of time.
例句
We had a long meeting with the attorney general...
我们和检察总长开了一个长会。
She is planning a long holiday in Egypt and America...
她计划去埃及和美国度长假。
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ADV-GRADED
（多）长（时间）
You use long to ask or talk about amounts of time.
例句
How long have you lived around here?...
你住在这一带有多长时间了？
He has been on a diet for as long as any of his friends can remember...
在朋友的记忆中，他一直都在节食。
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ADJ-GRADED
篇幅长的
A long speech, book, film, or list contains a lot of information or a lot of items and takes a lot of time to listen to, read, watch, or deal with.
例句
He was making quite a long speech...
他的讲话颇为冗长。
This is a long film, three hours and seven minutes.
这部电影较长，有3小时7分钟。
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ADJ-GRADED
超长的；过长的；拖长的
If you describe a period of time or work as long, you mean it lasts for more hours or days than is usual, or seems to last for more time than it actually does.
例句
Go to sleep. I've got a long day tomorrow...
睡觉吧。我明天还得忙呢。
She was a TV reporter and worked long hours...
她是个电视台记者，总是工作到很晚。
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ADJ-GRADED
（记忆力）强的，好的
If someone has a long memory, they are able to remember things that happened far back in the past.
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ADV
始终；整个地
Long is used in expressions such as all year long ,the whole day long, and your whole life long to say and emphasize that something happens for the whole of a particular period of time.
例句
We played that record all night long...
我们整晚都在放那张唱片。
Snow is sometimes found all summer long upon the highest peaks.
有时候山峰上整个夏天都有积雪。