Analog guy here with a simple solution. Get a calendar and a pencil. Start numbering work days each month. If you choose, you can then add them up to find workdays in a year. For your own personal work days available, If you have two weeks vacation, 50 weeks times M-F 5 is 250 days max, minus taken holidays.
Since i am in an ambulatory animal health care profession as a solo Lone Ranger, that number of work days is general 365, except for Leap year.
I am trying really really hard not to be FRivolous and sarcastic.
Thank you.
The problem is, I don’t have a pencil.
(or a calendar)