Amaya watches the movie without rewinding for 20 minutes + 15 minutes + 45 minutes + 20 minutes = <<20+15+45+20=100>>100 minutes duration of the movie.
However, Amaya also spent extra time re-watching parts she rewound, for 5 minutes + 15 minutes = <<5+15=20>>20 minutes.
In all, Amaya spent 100 minutes + 20 minutes = <<100+20=120>>120 minutes watching the movie.
#### 120