When we use adverbs of frequency, it's to show how often something happens. The adverb ALWAYS means 100% of the time and the adverb USUALLY is a bit less than ALWAYS. So in 100 days of breakfasts, I eat eggs 90 of those days. But if I ALWAYS eat eggs for breakfast then in 100 days of breakfast, I eat eggs 100 of those days.
Take a look here at some breakfast dishes from around the world. It's so interesting to see what people eat in different cultures!