Monday Hour One and Friday Hour Done

I just listened to this training and have a few questions:

1. What is overflow time and how do you use it?

2. In the two hour daily Focus Time block, what is considered a “result”? The instruction is to spend that time to produce a result. Does this mean if I sit down to that focus time with “write” as my activity I should make the result a certain number of pages or words or a chapter versus just sitting down and writing for two hours?

3. In the video instructions for Friday Hour Done one step given is to note three open items from the past week. If the point of Monday Hour One is to schedule and do everything in one week, how/why would there be three open projects to take note of during Friday Hour Done?

Thank you!