What is the time-box for the Sprint Review?

To get started in terms of what to build, Scrum requires no more than a Product Owner with enough ideas for a first Sprint, a Development Team to implement those ideas and a Scrum Master to help guide the process.

In order to achieve the benefits of Scrum, it is important to enact the value of commitment. What two actions demonstrate the commitment of Scrum Team members?

When is the Sprint Backlog created?