To direct the eyes toward so that one sees, or as if to see.
When you focus your eyes on people or things, you look at them.
When you examine something or a situation and decide what to do about it, you look at it.
When you think a certain way or have an opinion about something, that is the way you look at it.
When you say that people are looking at an amount of money or a length of time, you mean that this is how much they think something will cost or how long something will take.