How many really effective hours do you have a day? for me if you can stay focused 4 to 5 hours per day it's already great, at least for developers. Rest of the

How many really effective hours do you have a day? for me if you can stay focused 4 to 5 hours per day it's already great, at least for developers. Rest of the time can be spent reading your emails, tech news, meetings etc .. Work can be a really subjective word too ..