at a moment's/two hours'/three weeks', etc. notice idiom
（用于强调只有极少时间完成某事）提前一会儿/两个小时/三个星期（等等）通知
used to emphasize how little time someone has to do something or how little warning is given
We can't be expected to just drop everything and leave at a moment's notice. 不可要求我们能在接到通知后放下所有的事情立即离开。