Some of this makes you think and how you would go about it. Now for one, I'm 30. 18 year olds don't really interest me anymore. These are pretty much high school girls. They are inexperienced and dumb as fu*k. For 10 years, you also want a girl there who you can talk to seeing that's the only human interaction. Give me a girl in her mid 20s. But if she has to be 18, hell I may just jack off for 10 years and pick other sh*t. Knowing you will be 10mill richer after.
Also need a skylight. You don't want to go that long without any sun. Not even prisoners have to go through that.