Not in the country of its origin. In Japan, the black belt is seen as just another belt. Aside from being higher up in the ranking system, getting a black belt is no different from getting a green belt or a blue belt or any other colored belt, in proportion to your current skill and experience and what you've got to do to get it.
And yet, at the Kodokan at least, there is still a significant time frame difference from brown to black, compared with white to yellow, brown, etc. So, yes, in Japan, Shodan is not seen as a level of mastery, merely a beginning of understanding of the art.
Taken from a thread on the old Judoforum........
"I started training at the Kodokan in July with my eyes toward improving my judo technically and possibly attaining shodan. Prior to this, I trained in the States for about 1.5 years at Cranford JKC. A few observations at the Kodokan school...
Kodokan does advertise that someone can go from beginner to shodan in one year (there is a large banner on the side of the building that advertises this!) It is possible but its not a cakewalk.
Even if you have 3 kyu you must start from the absolute beginning. Your first day is tying your obi and maybe a little ukemi. You do nothing but ukemi and uchikomi for three months. (No randori for three months!)
At the end of the first three months (you must attend at least 40 training sessions which usually translates to three months), you are tested on the first fifteen throws of the Go Kyo no Waza (mostly from the first two groups), some newaza, and ukemi in front of a panel of three judges for 5 kyu. You must know the names of the throws and execute then as the sensei calls them out.
If you pass this test, then you can do randori. After another month (with good attendence), you can test for 4 kyu, the same fifteen throws are judged more strictly along with ukemi and you must demonstrate some randori.
After you pass 4 kyu, you can participate in the monthly batsugun shia. You need to come to practice at least ten times that month in order to participate in the batsugun shiai. For the shiai, first you must do ukemi in front of a panel of judges, then you have two matches.
If you get two ippon you are promoted, but if your ukemi is judged poorly you do not advance (the ukemi judging is very strict). With this ukemi restriction, they can hold back.
From 1 kyu to shodan you need six ippon. This translates to attending at least three batsugun shiai (with a perfect record). Next, you need to do the nage no kata in front of a Kodokan panel.
Therefore you need to allot time to practice the kata. The sensei will help you but you must first get your six ippon.
So, with strong technical judo the first three months, good results for the two tests for 5 kyu and 4 kyu, a perfect batsugun shiai record, strong technical ukemi demonstrated throughout (with some good will from the judging panel), and great kata you should be able to manage shodan in a year.
Good Luck!!!"