Thanks for your remarks. Few things come to mind: First I'd never charge by hour but have (at least) daily rates and I'd suggest every other independent software contractor to follow the same principle.

Second, there is no correlation between the amount of ASCII chars outputted per hour and the productivity/net gain for the client (at least for the type of work I'm doing for whatever that matters). Sometimes I do have to think hard about a problem for a longer period of time, maybe executing on a few ideas before finally presenting and motivating a solution I came up with for a given problem. That doesn't mean my computer desktop looked _productive_ the whole time. In fact much of the important work maybe even done on a sheet of paper.