Approved by support staff today:
While editing alert (Alert Wizard) getting to "Time of day" tab and selecting "Add schedule" , there's no way to change from default "Business Day (Mon - Fri)" to other working week's days.
(It could be done manually, but in more complex way.
There's no way to change this default value for whole system.
Requested feature is to include the possibility to change "Business Day" as a setting of NPM or Orion server
Case reference at SW:
[ ref:_00D506e2N._5002J1DXlIO:ref ]
Case # - 00451184