Here's how it's gonna go down for me (the times are off because I'm in Central Time)
Today- Download the game
Tomorrow- Get a good nap at around 4:00, set an alarm for 9:30 (the Friday Demo starts at 10 PM in my time), then go to sleep.
Saturday- Wake up early at 5:30, then play from 6 to 7, and then hopefully I'll have enough energy to stay awake until 2 PM so I can play the last one.
Sunday- Digitally Pre-order the game (screw the Gamestop pre-order crap).
Three hours of Splatoon.... Three whole hours...! I hope Nintendo does this every weekend until the game releases as
@Bellebound said!