I'm reminded of an old talk by Rich Hickey [1] (he created Closure, initially in semi-isolation over some years).

  > When was the last time that you thought about something for an
  > entire hour? ... Howabout for a whole day? ... or over the course of a
  > month? ... or a year? These are tremendously valuable moments, if you
  > get to have them at all.

[1] https://www.youtube.com/watch?v=f84n5oFoZBc