To be truly accurate, I average 60%, but it swings between 40% to 80% done as 5-6 half days. I think it is much easier to work on a team doing that than 3 days on four days off, so I should have clarified that. When I was an employee I did 5 x 6 hour days, and honestly, if you get your shit done, rarely is anyone going to notice you're in at 10 and out by 4 or whatever. I just didn't play ping pong or fart around on slack.

Is that contract/freelance work or a regular company?

The current one is an ongoing regular position as a 1099 consultant, but I have done it many times before as a contractor, and even twice as an employee. It's surprising how many places will advertise they only want full time but agree to 75-80% if you push on it and you're a really good fit. I just needed to make sure I was producing well enough at that rate to demonstrate that it works.