Isn't It about... Time?
If someone asks you what time it is, and you look at your watch/cell phone/sundial, do you give an exact minute? If it's 7:23, do you say it's 7:23, or do you say, "It's about 7:20"? I find I tend to round everything to 5 minutes. I don't really know what that says about me. What do you do?