You need to be on for the initial registration. After that, it tries with each load up but will continue working for a week if it can't connect. If that's the only thing you do online and then disconnect again, I doubt you'll get a virus. You can try contacting support. There have been cases where they have helped the person extend the time period.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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