Crushing the game in one day without sleep is entirely feasible. Most humans (healthy) will experience significant degradation in efficiency, awareness, and fine motor skills if not given 4 (non-continuous) hours of sleep in a 24 hour period. So you need to make a significant gains on your first day if it going to take more than 20 hours.
Having said that I have stayed up for over 98 hours continuous. Other people in my group started hallucinating at 60+ hours and had to bow out at that time.
Remember that motivation and caffeine are all you really need in life. A lot of Baldur's Gate and Money also help.
I don't think I can go without sleep entirely, but I have had 20+ hour gaming sessions peppered with the occasional 2-4 hour pass-outs. Usually involves a lot of energy drinks and feeling like absolute crap for a week afterwards, so I wouldn't recommend it :P
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Hmm...now I'm tempted to try it.
Having said that I have stayed up for over 98 hours continuous. Other people in my group started hallucinating at 60+ hours and had to bow out at that time.
Remember that motivation and caffeine are all you really need in life. A lot of Baldur's Gate and Money also help.
Did you know Morrowind, an even larger and more complicated game than Baldur's Gate, can be beaten in less than ten minutes?
Edit: a googled morrowind speed run, that's pretty insane.