If you don’t get your work done in a week… we can’t add the eighth or ninth day… all we can do is try again the next week, starting again on Sunday or Monday (in my case, the week always begins anew on a Thursday).
The same with Sprints – once you set the duration – that’s what you’re working within in – if you do or don’t get it done – that’s part of the process.
To figure out what you need to tweak for next time, to figure out what you have to change.
If you keep extending it, all you’re doing is adding the eighth, ninth, or tenth day to the week.
