I'm in the 10.5mph range. Did just under 8 miles in about 45 minutes today.

Still very out of shape and rehabbing a knee tendon issue, so I have to take it easy and avoid even downhill speeds that could help re-injure the tendon. Keeping the speeds down and emphasizing light spinning in lower gears has really helped.

Everyone has a different fitness level. I'm aiming toward a 10 mile ride, then I can set a new goal. When I got back on my bike earlier this year, 3 miles left me out of breath and nearly unable to walk. Any goals have to be set against your previous performance, not against someone else.