Eight days so far during 'work week' time. If he was going on his own dime, this wouldn't be worth talking about.
It just makes a better talking point to say 'he's golfed 37 days out of 152' despite it not being about how he's using his weekends (assuming we hold government to the same 5 on 2 off standard as most of us have) when it's really about how much it's costing.
A better headline would be 'President spends income tax of 20,000 Americans on personal entertainment'.