Welcome, Lori! Congrats on discovering the joys of cycling!

Your 7 to 9 mile ride length is about what I did, on average, my first 6 to 9 months of biking. Then I edged up to doing 10 as a minimum, with most rides in the 13-20mi range. Now I do 13-20 mile rides a couple of times during the week, and a long ride of 30-50mi most weekends.

Whatever feels good, is fun, and keeps you out there on the bike is the 'right' mileage for you! Enjoy!