[sake]

Distractions are not really my problem, it's mental exhaustion. If anything I think I should probably have more breaks, when I'm at work I just work. I see majority of people procrastinating, reading news, social media or socializing with coworkers to take their mind off work from time to time.

If you can work 8 hours straight with only a lunch break, I don't think you are doing very mentally intensive work.

[Rainymood]

I have studied and kept detailed logs of my work for years. When I reach 4-5 hours of "real" work (i.e. deep work) I am mentally exhausted and I consider it a good day.

No one expects you to be 8 hours straight in the zone, no one does. And if you can do so, the more power to you, but be careful not to burn yourself out.

3-5 hours of deep work - that's it

[SketchySeaBeast]

> No one expects you to be 8 hours straight in the zone, no one does.

I see we haven't worked somewhere with billable hours.

[ineedasername]

Sure, with meetings etc not all 8 hours is going to be deep work, but there's usually more in a workday than that. Meetings, mentoring, etc... But my impression of what the OP is saying isn't really looking at it that way, and is saying 8 hours is too large of a block for work in general, not just deep work.