Hilly but not extreme. The key will be to manage your effort in the hills. Just find a gear, and therefore a rhythm, that you can sustain. If you do that, it doesn't matter how long the hill is, you know you can keep plodding along until you've climbed it. Don't charge at them, just ride them at your own pace. If you do that, a sixty-mile ride, however lumpy, won't be a problem.