Congrats on your progress. As others have said everyone is different. I can't tell you how long it to reach certain goals because it was so long ago. But I can tell you, at least for me, that if riding becomes an addiction, it becomes less about a particular mileage goal and more about a particular place goal.

For me the one thing that differentiates riding from running is that you can actually go somewhere on a bike. Years ago, before every square foot of land in Orange County was developed, sometimes I'd roll out our driveway with no particular destination and had some great rides just wandering around. You may not be ready for that, but you can probably pick a destination and work your way up to getting there and back.

John