How many days continuous i can use my imac?

How many days continuously I can use my iMac, without going idle. Do I need to shut down for a while in 2-3 days?:

You can just sleep it in between - that would be fine. However, personally, I prefer to shut it down 2 - 3 times per week or so simply because it gets rid of all sorts of files, caches, and glitches during the startup process.

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