How much time do we spend in school on average?

Can I go to the Bathroom?

If you calculate based solely on the hours and years scheduled, it's something like @683 days on avg by the time we're 30.   This is based on a 180 day instruction schedule and 7 hrs per day.  How much time do we spend learning?   Take away lunch break, study hall, assemblies, pep rally's, home room, disruptions of various sorts (eg. bird got loose in the room; someone's puking;  teach is hungover, etc ), not paying attention, poor instruction, substitute teachers, getting out to work on the yearbook, travel for games, etc, the figure is considerably less, by about 25%.  These figures are for USA.  Some countries spend much more time in class and/or in supplementary classes.  In some other countries, large segments of their population receive little or no education.