None. Their parents will do it for them.
TRICK QUESTION. THEY CAN'T CHANGE ANYTHING**
Well, turns out one is not enough, but if you pair it, two can.
A: One -- but it's an 8 hour minimum.
None, they'll just keep complimenting it and get mad when it doesn't want to screw.
Your parents would know!
It is now a parent.
Because they just can't even