A contract is an ask game, and if it asks for an hour, and I submit to an hour, then it's an hour. When I look at a contract, I look at the obligation - where, when, how long, the compensation. If I agree to it, that's the way it is. I have an obligation. They have an obligation.
You marvel at the economy and this choice of words. How many ways can you describe the sky and the moon? After Sylvia Plath, what can you say?