Back in the line bidding days I tried one month a day line line. What I got out of that was 10-11 hours of each of my day dedicated to work including commuting to the airport. I looked at the difference in what my typical per diem was for the month and it was a $500-600 cut from what would usually show up on the middle of the month check. Not worth the headache IMO. That per diem throughout the year adds up. Before anyone tells me per diem isn’t pay, let’s not pretend like $4000-5000 a year added to my check isn’t noteworthy.