I did it! I named all 50 states, and in less than 5 minutes....
...And it only took me four tries.
The first three times, I used up all 10 minutes and still forgot huge portions of our country -- not many states, mind you, just big ones like, say, Nebraska or Montana or Oklahoma (Oklahoma! How could I forget Oklahoma?!? There's a whole musical about Oklahoma, for cryin' out loud!).
All I can say in my defense is, it's harder than it seems like it ought to be. Especially if you attended elementary school in the deep south, where they required you to learn the names and locations of only the Confederate states.
Give it a try. Let me know how you fare. Good luck!