It's not hard in the sense that solving complicated math problems is hard, but hard in that it adds a non-trivial amount of effort to an activity you do multipl

It's not hard in the sense that solving complicated math problems is hard, but hard in that it adds a non-trivial amount of effort to an activity you do multiple times a day, every day, in perpetuity. Even the small effort of measuring your creamer with a teaspoon instead of just pouring it in the cup just takes more time and effort than simply checking what time it is.