Sprints are more efficient than marathons

Work is non-linear, you will reach higher complexity, intellectual needs and innovation when pushing the limits on a straight sprint.

Sigmund Freud used to run sprints too, in his thinking retreats he would just stay alone and work hard on his idea for a while, then go back to the society again.

Just look at industry, we’re moving from the 8 hours/day 40 hours work week to just “work whenever you want” and the later is much more efficient. You can just focus hard for 4 hours and achieve what you felt forced to do in 8 hours.