About the use of "longer" and "more"

Hey I am having trouble wth this phrase:
"People are spending more than 10 minutes a day longer on X than on Y". (X and Y not important)

Can we say also say here: "People are spending more than 10 minutes a day more on X than o Y.

Why do we use "longer" in the first sentence? Can we not use "more" again after "a day?
I am asking this because it confuses me because if there wasn't "more than" in front of "10 minutes", "more" would come after "a day" meaning: "People are spending 10 minutes a day more on X than on Y".

I guess I am having trouble with the difference between "longer" and "more" here. it look interchangeable to me in terms of meaning.

Because we normally say: "People spend 10 minutes more on X than on Y"
But: "People spend more than 10 minutes more on X than on Y" not correct?

Thanks,