I think Linus Trovalds in an interview was saying something of the sort: I do not believe in crazy schedules. It does not worth it to work one day for 16 hours

I think Linus Trovalds in an interview was saying something of the sort: I do not believe in crazy schedules. It does not worth it to work one day for 16 hours because the next day you will be like a ghost. Work as much that you will be able to work equally much and a lot the next day. I do not think that it would be possible biologically to keep that pace of work(10-11 hours programming days) for long periods. The exception: of course sometime when an emergency shows you should work and 10 and 15 and 18 hours straight