In my opinion, you only have about 4 hours maximum of quality coding in you a day - I want to stress the quality part of that. You can code 12 hours a day, but

In my opinion, you only have about 4 hours maximum of quality coding in you a day - I want to stress the quality part of that. You can code 12 hours a day, but compare the code in your first 4 hours to your last 4 and see what I mean. Just stop coding. Do other stuff. I find that I can extend that quality window by spreading it out more. Don't do 4 hours in a block. Do an hour, or 1.5 hours and break for 30mins. Clear the head again. Then go back, you can do this more - leading to > 4 hours of quality code