Norder for a driver to graduate from a learner’s license to an operator’s license, how many hours of driving need to be documented? how many nighttime driving hours are required?

That's up to the state in which you live. There are many different systems.
You need to check with your state's Department of Motor Vehicles or
department of Transportation.

Must have drove 50 hours on a learners permits, 10 of which are at night.

I think for at least three days of testing and then you are good.
Not sure though. My friend told me

depends on which state you're in. in my state (Colorado), you require 50 daytime hours and 10 nighttime hours at least.

According to my DMV book, 50 hours total and 10 at night. I'm taking drivers ed right now actually :P

To move on to your intermediate driver's license, you must: Be at least 16 years old. Have had your learner's permit for at least 1 year without incident. Have completed a minimum of 50 hours of behind-the-wheel driving experience (10 hours must be at night).

So 50 hours documented

10 of which must be at night

Hope this helps :)

Answer and Explanation

In the United States of America, driver's licenses are issued by each individual state, territory.

In order for a driver to graduate from a learner's license to an operator's license, how many hours of driving you need to be documented is 50 hours, of which 10 hours must be at night.To move on to your intermediate driver's license, you must: Be at least 16 years old .

50 hours which 10 of them is at night

It could vary from state to state. In NC, it has been 60 hours total documented driving under the supervision of a licensed driver 21 or older, and 10 of those hours have to be at night.

I think it was 45 hrs total and either 15 or 20 nighttime