1.How long is one month?
You can find the answer from the students who are busy for the papers and final examinations.
2.How long is one week?
The journalist of the weekly can give the correct answer.
3.How about one hour?
You can ask one of the lovers waiting to see another.
You can ask the passengers who has missed the train.
5.What significant is abut one second? 0.1 second? 0.01second……
The sprint athlete can answer the question.