Board Thread:Questions and Answers/@comment-3250527-20140627033401/@comment-6697950-20150701093748

"To be a little more specific, disconnection from an outside source of electricity for ten minutes, being cut off from the system for more than two hours, or any attempt to: unlock, dismantle, or destroy the Nerve Gear. If any of these conditions are met, the brain destruction sequence will start." (from fan translation of volume 1).

Anyway, back on topic, the OP was referring specifically to the time it takes for the NerveGear to kill a player after they die in-game. Disconnection from the Internet or a source of electricity does not result in death if the connection is restored before the deadline, so it's not a death timer, but more like a safety net or something.

And there was no exact time for the death timers given in the novels. That's why this topic was made in the first place. If you think otherwise, feel free to find the exact place where the exact time was mentioned.