曾有一段时间，每个老师每周都花一小时来测验学生的各门功课。

There was a time when each teacher spent an hour, one day a week, testing students in every subject.

《柯林斯英汉双解大词典》

阿沙德曾有一段时间保证情况会好转。

There was a time when Mr Assad promised something better.

youdao

曾有一段时间他能边弹吉他，边唱歌。

There was a time when he was able to sing, while playing his guitar.

youdao

It used to be that mortgages had what's called a balloon payment at the end.

曾有一段时间,抵押贷款中有期末大额偿还制度

耶鲁公开课 - 金融市场课程节选