In the beginning, five miles was a long way, but a few weeks into regular riding, five miles was hardly worth hauling the bike out of the car. I'm a year into riding on a pretty frequent basis (3 times a week or more), and 20 miles is my usual ride, but I like to do 25.
I'm on a mtb, though, and it's heavy, and I'm sure I could do much better on a road bike. I just can't afford a good one yet. Still loving the ride, regardless.
Good luck increasing your mileage gradually - this may help avoid muscular injuries. Watch out for IT band injuries, especially, from going too far too soon. I learned that the hard way.
This is a GREAT community for learning about the sport at all levels.
Roxy
Getting in touch with my inner try-athlete.