英语中many和much的用法疑问

问题描述:

英语中many和much的用法疑问
这是VOA美国之音里的一段话:Usually,students are permitted to work as many as twenty hours a week during the school term.In the summer months or during holiday periods,they may work as much as forty hours a week.
同样是说工作多少小时,为什么前一句用as many as ,后一句用as much as

前面一个是正规用法,as much as 是为了避免重复才使用的.因为是VOA,所以这种用法能本土被接受,不认为是错误.但中学英语看来,不要效仿VOA,因为这是中国.