It's possible someone will have some suggestions... but it looks like it uses a bit array and from past experiences... this is harder than it should be with kix...
Powershell Examples
https://richardspowershellblog.wordpress.com/2012/01/26/setting-a-users-logon-hours/
https://gallery.technet.microsoft.com/scriptcenter/fd6a340b-ed8b-4787-8d12-3c6fcb822104
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(... better days ahead)
