It sounds like you're doing ok. My first few years, I had a 'ladder' route which I did 3 times per week. It started short in the spring - 15 miles - and by mid-summer it was 30 miles. When I joined the local club, I started adding longer weekend rides, and replaced my ladder route with evening club rides. Nowadays, evening rides vary based on when the sun goes down, but usually 20-30 miles. Weekend rides can be 40-100 miles. I'm not into ultra-mileages; I believe that when I reach 100 miles in a day, it's time for a beer!