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#11
Mine runs 24/7. I am usually on it 8-16 hours a day, and it's also used as a media server, so i can access media where ever I have internet access on my phone or ipad.
There are people running machines at 100% load for 24 hours a day 7 days a week "Folding". That can be expensive, but it's for a good cause.
Safe unless you considering having children in the foreseeable future