What are "unlimited spins" on the Premier package?

[sonomaphil]

Just wondering what unlimited spins means while the casino is open on the Premier package. 

 

Princess Prizes
Princess Prizes is your chance to win big prizes on your cruise, everything from cash to free cruises. And it’s easy to play. Just open your stateroom door, and watch your door portal to see if you’ve won. One in five tries wins – and you have unlimited spins while the casino is open! Take a look at what you might be able to win: onboard spending money from $5 to $250, wine tasting on board, Chef's Table, free cruises, and the ultimate grand prize of $100,000 cash!

[jwattle]

That's the "open your door" prizes for the "Princess Premier" or the add the "Princess Prizes Only" for $20/day ...It means that you can, for every five minutes, open your door for a chance to win.