I think it would be a lot less than 20%. It's so much easier to context switch into and out of the "work" mindset in other fields. By default, this "computer b

I think it would be a lot less than 20%. It's so much easier to context switch into and out of the "work" mindset in other fields. By default, this "computer brain" of mine is carried with me when I leave work. I have to make a concentrated effort to context switch back into "real life" mode (similarly how I have to context switch into "computer" mode). I think that's why so many of the good programmers are a little weird and introverted, because they don't bother to context switch back.