If you have under 50 spins, 6 spins will be refilled every hour. But the max count of spins is 50. This means that if you have more than 50, the refill counter will not work until you have less than 50.
Also every time you watch a video, you will get 1 spin instantly! if it's the 1st time you watch a video, you will get 20 spins as a special event! Don't miss out!