16 is about what i do, and 20 miles comes at about 1:10, so i think we should all ride together its a little hilly where i am but nothing to write home about. I have been riding for 3 months now, and I would say that you need to build up the muscles first once your legs stop to hurting after 15-20 miles work on time. but, try not to let speed be your governing factor, time and distance come first.