We are testing whether a TV that asks you two questions gets you watching something faster than scrolling the guide yourself. To know that, we need both: the assistant and the normal way.
Come when you actually want to watch something. If you are just curious about the toy, that is fine and useful too — but say so in the last question. A curious colleague pressing buttons is not a user, and if we mix the two the numbers stop meaning anything.
Up to 15 minutes, most of which is just watching TV. You can stop any time with the button on your phone.
It is not you. Press "something broke" on your phone and tell Rodrigo. A failed session is thrown away rather than counted, so nothing you do can spoil the data.