When should mirroring turn itself off?

I have the latest aTV, and an iPad2, both running latest software.

When I turn on Mirroring on the iPad, it does as expected, and iPad screen is mirrored on TV.

 

At what point should mirroring stop if at all?

 

e.g. When I use the aTV remote's 'menu' button, mirroring and Airplay are reset on the IPad, is this normal behaviour? There seems to be a distinct lack of instructions on how to use the aTV, or is it me?

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