In 8.5 hours you’re giving that person 1000 years of time to think about exactly how they’re going to kill you when their 8.5 hours are up.
I'm pretty sure a person would be more likely to come out of 1,000 years of imprisonment as a gibbering, broken shell of a person than as an angry, violent revenge-machine.
Relax, this isn't even the most hammered he's been this week.