Why travel for 3 months?

The number one question we have gotten about this trip is:
3 months!? Wow! Why travel for 3 months?
We've asked that question ourselves and come at it in two parts.
Part 1:  Why travel?
In reading blogs, books and travel sites you see that some people travel to lose themselves, some to find themselves, some for adventure, some because they just can't sit still, some because they want to change the world, some to learn more about the world.  I know this is not an exhaustive list.
But, no matter the starting point, I think when you travel you are changed.
Your perspective on life changes.  You learn to walk in a tension that comes with the reality of the vast differences in our world, how that makes you feel and what you want your role to be.  You become more thankful.  You become more interesting.  You become more informed.  You have an opportunity to experience how others live, think and see what they value.  You push yourself to have adventures, be uncomfortable, not have all the answers, take risks and come out empowered because you did it.  A goal I have for this trip is to say yes to the scary, to the unknown, to the uncomfortable and also to listen and observe and learn from the people and the world around me.  I travel for adventure and new experiences knowing that I will learn more about myself, and in that be changed. And change is good.
Part 2:  Why three months?
To put it simply.  Our daughter asked!
And how can you say no for a chance to learn more about your child and build into your relationship?  How can you say no to the opportunity of watching them discover more about themselves and the world around them?  How can you say no to creating a memory that will last a lifetime?  How can you say to no to your 16 year old when they are asking and willing to put up with you for 3 months straight?
We couldn't say no.