I hear that you are supposed to get eight hours of sleep for optimal health, and that the ideal amount is actually around 9 hours or more. I am 22, and I don't have much time in my schedule.

And I was wondering whether getting seven hours of sleep every night is enough for good health?

    

Well as you have described that you are 22 so in accordance with that i would say its perfect sleeping time. 7 hours are more then enough for your health. Infants sleep for 8 to 10 hours. Seven hours sleep gives proper rest to body of 22 years old person.