[boyadjian]

I totally agree. In my job, we work 37h30 a week, and have supplementary holidays. So it makes a day lasting 8h30, including one hour pause at midday. For me, concentrating during 7h30 is impossible, usually, after 6h of work, I am completely saturated. Same thing for me, takes the whole evening to cool down before sleep. For me, a programmer should work 6h30 a day, that would be a good starting point.