Yeah, really. Here are the requirements
from the USAF website. USAF requires 400 days for shodan, 700 days for sandan, and "if you have to ask, you can't afford it" for yondan.
Even the upper kyu ranks require enough hours that you're talking years, not months.
That's the 1989 requirements. They shortened the requirements this year.
And are now requiring 1st kyu to attend seminars like shodan and nidan has too.
1st kyu is suppose to start showing the seriousness of a blackbelt anyways.