Just a heads up for everyone: this test is EXTENSIVE.
There are 3 separated test. The first one runs 30 minutes, the second for an hour, and the last for 6 hours. My console is connected wirelessly via the N adapter, however I'm not experiencing any network slowdown on my main desktop (that's hard wired)--so I guess if you want to turn your console on, run the tests and come back later--you shouldn't experience any slowness on any other computers on your network.
I kind of thought it was ironic that Microsoft trusts their consoles enough to be left on for 7.5 consecutive hours.
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It's cumulative. First test 30 mins. Second Test another 30 mins for a total of 1 hour. Third test 5 hours for a total of 6 hours. If you are that worried about it put a box fan next to it and watch a couple of movies