8-10 hours, sometimes 12 depends what am i doing…
Visual work keeps me pinned down without blinking for 4-6 hours if the project is interesting and rewarding, and breaks are usually shorter than 15 minutes. Using the breaks forcedly, in order to get a refreshed perspective on what I did previously, and repair anything I might not have noticed.
When dealing with text, I take 30 minute breaks every 1-2 hours to silence my brain from pushing endless wording alternatives and then get back to it.
In total, I tend to go for 10-14h / day work, and slow down during the weekend. But I must say, what mrcharlesbrown said applies 100%, so this is all just “estimates”.
on Graphic Design the most like 2 hrs then my eyes hurt but when Im Battling 35 feet House Fires like 8hr straight! None Stop!
I have a cigarette pretty much every hour, but it’s not a long drawn out affair… I hoover it down and then get back to the grind. Can probably go six hours without a proper break. No more than 16 hours in the day or I start flagging.
I usually prefer to work during 3-4 hours and then 1-2 hours break. Second part of work time certainly less productive than previous part. I also prefer eveninings for my photoshop works and morning for music production.
For production ( coding : convert the design into WP ), start work start at 09:00pm – 05:00am ( always spent 1 – 3 hours to watch youtube / read online news, etc )
If I do something challenging and interesting, I can work even 10 hours without a break.
But if I do – instead – something boring or imposed by someone else, I need a break every hour finding always a reason for a coffee break or a chat break….
When I’m working on an interesting or difficult project, I won’t notice the passage of time and I can spend even 12-13 hours without a real break.
Of course this won’t work when I’m working on a PSD file and my eyes will start blinking after a few hours.
By the way, I usually will take a break once my wife will start to threatening me that she’s getting tired of my working