I think this is the right approach, you can't compare programming to working on assembly line, i.e. the more time you spent typing in your editor is directly tr

I think this is the right approach, you can't compare programming to working on assembly line, i.e. the more time you spent typing in your editor is directly translated in more goods or value to the customer. Even if you should fill something like hours spent programming, I don't think it should be interpreted that literally. Your customer is buying your overall expertise, not only the ability to translate requirements into machine code.