B：How busy is your schedule?
      你的工作忙吗？

A：I work (six days/ five days/ sixty hours) a week.
      我一星期工作（6天/ 5天/ 60个小时）。

1. (数字) 60
    Sixty is the number 60.

    e.g. ...the sunniest April in Britain for more than sixty years.
           英国 60 多年以来阳光最灿烂的4月

2. 六十几(指 60 至 69 之间的数字)
    When you talk about the sixties, you are referring to numbers between 60 and 69. For example, if you are in your sixties, you are aged between 60 and 69. If the temperature is in the sixties, it is between 60 and 69 degrees.

    e.g. ...a lively widow in her sixties.
           一位年过花甲、精神矍铄的寡妇

3. 二十世纪六十年代(指1960年至1969年)
    The sixties is the decade between 1960 and 1969.

    e.g. In the sixties there were the deaths of the two Kennedy brothers and Martin Luther King.
           20 世纪 60 年代，肯尼迪兄弟和马丁·路德·金先后去世。