More generally, they say it takes 10,000 hours to become an expert at anything. If you were to spend half of each 8 hour working day programming (as opposed to

More generally, they say it takes 10,000 hours to become an expert at anything. If you were to spend half of each 8 hour working day programming (as opposed to other tasks) for 50 weeks a year, that is 1,000 hours per year -- 10 years! Sounds about right to me.