I recently hired an electirician to do some work in my house for $700 (including materials which he figured in at about $100). I was figuring it would take him about 2 days or even one long day. Instead it took him 2+ days. I must admit I was impressed with the quality and his timeliness, however I now understand why he drives around in a beat up station wagon. The moral to this story is that when estimating, you have got to really know your costs and be able to nail down your time spent on the job. To really make it in any business you have got to know what to charge, personally I think $200 per day for a highly trained professional is cheap.