Straight up for over 72 hours when I was still a student. It was a mega sales rougue-like game that CHUNSOFT (Former game company of Spike chunsoft) made. Despite it had passed over a decade after the first release, yet this game had a on going price like somewhere between 80,000 yen - 100,000 yen ( $800 - $1000? ) at the time. Super duper addictive game, that was.
During this whole 72+ hours, I didn't eat, didn't sleep, slightly took the time to drink water, even forced myself to be patient with bathroom needs (how silly if I recall!) and kept playing it. When it had passed 2 days, I repeated slipping in and out of the dream constantly, and yet tried to keep playing, until eventually I completely passed out, This was not just once even.
This game, and NL is the only video game I play.