Unless there is some sort of significant impediment to changing a bulb (eg. a covered fixture), it takes 30 seconds to a minute maximum to change a bulb. It wil

Unless there is some sort of significant impediment to changing a bulb (eg. a covered fixture), it takes 30 seconds to a minute maximum to change a bulb. It will probably take everyone reading this more time to read the article and participate in this thread than it will to change every light bulb in their house for the next decade. It's negligible. There are many things to take into account when purchasing bulbs; chance are, the time it takes to change them is not one.