“有一段时间”用英语怎么说？

过去有一段时间
1.at one time曾经有一段时间
1.There was a time
2.there once was a time
3.there was a time when一会儿；有一段时间
1.for a while已有一段时间
1.for some time

说法以下几种：

1. There was a time when

   eg：There was a time when I felt lonly.有段时间我感到很孤独

2. at one time

   eg：The song had a great vogue at one time .这个歌曾经风行一时。

3. there once was a time

   eg：Once upon a time, there were two men, who were brothers.从前有两个人，他们是兄弟。

4. for a while

   eg：Now that I am free, I can enjoy music for a while.既然有空，我可以享受一下音乐

5. After a while. 

   eg：After dinner sit a while ; after supper walk a mile.谚饭后百步，延年益寿。

there was a period of time...

一段时间可以翻译成:aperiodoftime或者forsometime
那句句子可以翻译成：
iwon'tsurftheinternetforsometime.
或者：
iwon'tsurftheinternetforacertainperiodoftime.

there
was
a
time......when......