An electrician once told me that turning your computer off and then on again uses more electricity than just leaving it on for hours, an oversimplification if not an outright lie that I believed for years. While it is true that turning your PC off and on puts wear and tear on the components, so does leaving it on for hours and hours.
Now that turning a PC on takes an amount of time so miniscule you don't even have a chance to get a drink before it's ready to go, there's no good excuse for adding to your power bill by leaving it on. Of course, we do things we have no good excuse for all the time, like starting another campaign as Karl Franz in Total War: Warhammer despite all the other campaigns we haven't even tried yet.
