In what respect are they indistinguishable? They all use the same magnitude of measurements? But of course, each of the three spatial dimension have an orientation, a direction of measurement, and each dimension of orientation has measurable properties. Time also has a very specific measurable temporal orientation, forward from beginning to end of duration.. Therefore the term "length" as a temporal measurement of the beginning and end of a duration is certainly acceptable. Length itself is a magnitude of increments. And of course there is a "breadth of time". Another colloquialism? The thing is that you are using the term Magnitude in a different context. Order of magnitude https://en.wikipedia.org/wiki/Order_of_magnitude Differences in order of magnitude can be measured on a base-10 logarithmic scale in “decades” (i.e., factors of ten). Examples of numbers of different magnitudes can be found at Orders of magnitude (numbers). The Exponential Function uses magnitudes of numerical growth. Here are some more synonyms for your term magnitude mag·ni·tude, noun 1. the great size or extent of something. "they may feel discouraged at the magnitude of the task before them" Similar: immensity, vastness, hugeness, enormity, enormousness, expanse, size, extent, greatness, largeness bigness. Opposite: smallness https://languages.oup.com/google-dictionary-en/ As far as I am concerned you are engaging in sophistry. OK, put your money where your mouth is. Can you explain to me the magnitude of 17.84 hrs. I kid you not. I am looking at this now. It has me stumped. Hours per month Code A .............. 17.84 Code B .............. 20.00 Code C .............. 37.32 Code D ............. 69.28 ----------------------------- Total hours ...... ?????