Look at Taraje Williams-Muuray's blog to see all the time and sacrifice it takes to get to the Olympics.
Also, if you watch his fight against the Japanese guy you will notice he has about 4 sprained fingers all taped up. You are constantly fighting with multiple sprains if you wanna get good and get your 2-3 practices per day in.
I would say all Judo Olympians probably have 10,000+ hours of mat time. That's 6 years at 4 hours a day if you wanna try and reach the Olympics 8 years from now. That doesn't count the off-mat time doing exercises, and travelling around the country to competitions.
I personally think most people do not have what it takes to sacrifice their family, money, and friends for the lead up to the Olympics.
The only person I can think of starting as late as you is Rhadi Ferguson (Yes, he is Kimbos distant cousin). He however had 4 years of collegiate wrestling and is known for his work ethic among OLYMPIC LEVEL ATHLETES. So uh, it's probably far to late.
you could have started when you were a little kid and chances are you wouldn't have what it takes to make it to the olympics. its just like anything else... do you think there is a certain amount of time you can practice tennis before you're on nadal or federer's level? no. some people have it and some don't. so ignore the fact that you haven't been training since you were a little kid and have not put thousands of hours into it. you have to be talented to get to the top level. i know that sounds discouraging but it doesn't mean you shouldn't do judo just because you like it and want to see where it takes you.
if your looking to get olympic level good at judo heres what you need to do.
step one get rid of everything important where you are currently living
step two move to tokyo japan, germany, or brasil all three put out more top level judo comptetitors then alot of other contries combined
once there find a school which you can train at for at least 2-3 hours a day 5 days a week
once you find that school LEARN LEARN LEARN at that school you will probly make black belt in around 2-3 years second dan in another 2 years maybe and maybe 3rd dan another 4-6 years after makeing second dan
remeber in judo getting the black belt is just like graduating high school and your now a freshman in college so BB is not all that speacial when you can wear a kohaku belt then you will be very respected but you most likely wont get there until your about 70 yrs+ the dan ranks over 3rd dan take in excess of 8 years each for the most part for that is when you become a "teach" not a "student"
if you dont know what a dan or kohaku is judoforum.com very good sight with lots of info about judo all over the world
^Olympic competitors don't really worry about their belt. I heard a lot of them are 1st dan blackbelts. I've heard many of the Russians and Cubans know only a few throws--they just do those throws extremely well. Dan levels are basically irrelevant at the Olympic stage.
You forgot Russia and Korea, which have more Judo medals than Germany I think. I think Cuba has more, and maybe even France.
If someone wants to get good from scratch, they can train at the Kodokan and do their "black belt in a year program" where you train most of the day for a year. Lots of people have traveled to the Kodokan to do it and you will see people from all different countries there.
The next thing to do would be to try to get into Yongin University in Korea or Tokai University in Japan, and study Judo as your BA.