When you are preparing for a natural disaster or large scale emergency how long do you plan on being stuck before help arrives or things get back to normal?
Is it a few days, a few weeks, a few months,a few centuries or is it longer than that?
Look at how your local services have responded in the past. That can help you get somewhat of a benchmark.
How well folks adapt depend on several things:
How well is one prepped:
If you have enough water for a week. Then a week isn't so bad. If you have enough water for a day. A week is way too long...
Previous experience:
Being without power for one day for some of the younglings is a hardship. Those of us who have gone for a week or more, have a different perspective.
Attitude:
A bad attitude makes everything seem longer. Remember the old adage; "time flies when you're having fun".