Question

different between instant of time and duration of time with examples?

Answer 1

If we say that an instant of time has no duration, why does a sum of instants add up to something that has a duration? I have a hard time understanding this.

I think of one instant as being a 'moment' of time. Hence, the sum of many instants would make a finite time period (for example 10 minutes).

EDIT: Since I got so many great answers, I was wondering, if someone can also give a illustrative example, besides the pure math ? I am just being curious...