I does not appear those fields are available from smart values...yet.
They are available via the REST API:
So, I believe you could make a webrequest to the REST API, save the working hours per day, and then use that value in your calculation. Here is how to call the REST API from an automation rule:
Please note: this will take at least several seconds per rule execution due to the webrequest call.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event