Could this post be somewhat in response to this post:
I have run 4 design sprints and while I am no expert, the biggest issue for me is getting product owners and business-y types to truly commit (both in time and participation). Design sprints will never replace the value of research. We spend a good portion of our first day (Monday) presenting research on our users that we’ve gathered in preparation for the sprint itself.
I disagree with the commenter who said sprints take longer than a week. If they are taking more than a week, your problem statement is too broad, there is too much discussion/getting lost in the weeds or participants are have become too precious about their ideas. You really need a strong facilitator to move things along and force decisions to be made quickly.