It can be efficiently arranged in two ways, although most often we see eggs in cartons of 2 rows of 6. It can also be evenly divided in more ways than 10. Commerce has seen the use of dozens in packaging many other things. For large amounts it is common to find a dozen dozens, as in a shipment of pencils. Children now love to hear the name given to 12 sets of 12, a gross.
Units of time can be a problem.
To go from seconds to minutes we use a ratio of 60 to 1. To go from hours to days, we use 24 to 1 . But most of our clocks only show hours up to 12, so children have to learn there is a morning set of 12 which starts at midnight, and an afternoon set of 12 which starts at noon. To go from days to months children have to learn this is flexible, but 30 to 1 is often used. After this last, it seems we finally go back to a ratio of 10 to 1.