Maybe you had a few games running at the same time, because those hours add up. You can run around 30 games at once on one device. And no, I don’t think you’ll get banned for it, but idling games or farming hours isn’t really worth it.

Edit: Since you’re using SAM to farm achievements, that explains it. You’re just inflating your stats, using a tool to unlock achievements all at once, and then wondering why your hours are high too. Pointless.