Plus add the 10 years to get to first degree to make it 40 years. But that formula dosen't work in the higher Dans. Joe Moreira was a 6th Degree when I met him in 1998 and still is a 6th degree. Same with Rickson, been a 7th maybe as long as Joe's 6th. Rorion and Reylson have been a 9th degre for a long tome too. I think the 3 year formula is only early on in the low Dans.