more interesting or the most interesting?

[ARUK2008]

There's an exercise here and I'm not sure if both answers are right.

Ex. What aspect interests you the most?
(find/interesting)

My answer: What aspect do you find more interesting?

Right answer: What aspect do you find the most interesting?

Maybe it's kind of obvious in here. But still I wonder if my answer will be OK.

2 question: For HOW LONG or HOw long? Can I use both either way?

[bhaisahab]

There's an exercise here and I'm not sure if both answers are right.

Ex. What aspect interests you the most?
(find/interesting)

My answer: What aspect do you find more interesting?

Right answer: What aspect do you find the most interesting?

Maybe it's kind of obvious in here. But still I wonder if my answer will be OK.

No, your answer is not OK. The clue is in the question, "What aspect interests you the most?"