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From experience, I would say very. The longest I've been awake is ~5.5 days though.

Brain damage can start around that point... Watch out

Source? I expected harm would come much earlier.

I'm in the middle of stuff and can't google a more concise source but I recall it being about 4-5 days

I hit that figure quite a bit back in my stimulant abuse days.

But your blog post specifically refers to chronic sleep loss.

Did you do anything specific to stay awake? After a certain number of hours, I really have to keep myself busy, or my brain just shuts down.

Playing games, specifically Diablo 3 & CoD MW2, separate times