Probably no more than 3/4 hours. After that, I find that the quality of code goes down significantly. Of course, this would be different if this 3/4 is spreadou

Probably no more than 3/4 hours. After that, I find that the quality of code goes down significantly. Of course, this would be different if this 3/4 is spreadout throughout the day with other "filler" jobs in between.