> only if you make a case that six to eight hours of deep work is somehow not possible. 6 to 8 hours of deep work is certainly possible but is it sustainable?

> only if you make a case that six to eight hours of deep work is somehow not possible. 6 to 8 hours of deep work is certainly possible but is it sustainable? I don't think so, minds need some slack time, enter a different mode of thinking, etc. For this reason work is chunked into workable amounts which it makes it sustainable as well.