30 days. However there have been some reports here of end users able to convince Amazon to change their KSO to a non ad version, given then the KSO feature is under their control by virtue of the serial number. However, it is really no big deal. People get used to these and having your own personal screen saver was never an Amazon feature. You could always wait until there is an ad you want and then just delete all the other ads. If you stay off of WiFi, which it sounds like you will do anyway, you can get what you want.
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