When I was cycling 100 miles a week, I found I needed about 3500 kcal / day to sustain myself, and it wasn't easy. On a typical day, I ate 3-4 normal breakfasts throughout the morning (a bagel w/ cream cheese, a smoothie, 2 or 3 eggs and toast, maybe a bowl of oatmeal). Dinners were typically a massive serving of lasagna or similar pasta. Lots of snacks throughout the day. The only days where I would say that I easily got enough calories were when I gave in to the temptation of a fast-food hamburger and milkshake. However, as long as I was cooking at home, it was quite a bit of work to keep up with the calories I needed.