I'm wondering: do you really count the training hours at your dojos?... We just look at the requirements in years ...
When you do your dan examination at the AFD you have to fill in the number of days of practice in your application form. Because it's a hombu grade and hombu requirements have to be fullfilled.
If you practice three times a week on a regular base plus some seminars you will approximately meet the minimum number of years of practice before next grading.