Microsoft Certification Authority ValidityPeriod to 10 Years

certutil -getreg ca\ValidityPeriod

(This returns the current value of 2)

certutil -getreg ca\ValidityPeriodUnit

(This returns the current value of Years)

certutil -setreg CA\ValidityPeriodUnits 10
certutil -setreg CA\ValidityPeriod Years
net stop certsvc && net start certsvc