“48 hour” coding sprints. This kind of attitude not only hurts young workers who are willing to “step up” to the expectation, but facilitates ageism and sexism by indirectly discriminating against people who cannot maintain that kind of schedule.
If You Want to Work Hard, Live Well
Dustin Moskovitz

Some of the most brilliant, talented computer scientists I know chafe at this model because they end up (a) wasting inordinate amounts of time in pre-, mid-, and post-sprint briefings, and (b) either killing themselves to keep up with the sprint or feeling guilty for falling behind when it inevitably proves unsustainable.