User Configuration > Administrative Templates > Microsoft Word 2016 > Word Options > Security > Cryptography
User
HKCU\software\policies\microsoft\office\16.0\word\security\crypto
This policy setting allows you to specify the number of times to spin (rehash) the password verifier. If you enable this policy setting, the number specified will be the number of times the password will be rehashed. If you disable or do not configure this policy setting, the default (100000) will be used.