Password policies cannot currently be applied to system administrators.
Also, there are no arrangements for regular password changes.
In addition, intra-mart Accel Platform 2018 Summer(Tiffany) or later can apply multi-factor authentication to the system administrator.
■ intra-mart Accel Platform System administrator operation guide
"Set up Multi Factor Authentication"
https://document.intra-mart.jp/library/iap/public/operation/system_administrator_guide/texts/admin_guide/admin_guide_3.html
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iAP/Accel Platform/All Updates
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FAQID:1255