what does it mean?
몇시간잤어어제아침에~
I'm sure 98% it means "How many hours did you sleep yesterday"
But 2% of me says its "what time did you sleep yesterday"
When I keep reading the sentence I say "No it can't be what time....etc it must be how many ...etc"
But then again I say "No it must be the second one!"

I don't like it when I get confused :(
Maybe because I havent been studying korean since 2012 :(

Question

what does it mean?
몇시간잤어어제아침에~
I'm sure 98% it means "How many hours did you sleep yesterday"
But 2% of me says its "what time did you sleep yesterday"
When I keep reading the sentence I say "No it can't be what time....etc it must be how many ...etc"
But then again I say "No it must be the second one!"

I don't like it when I get confused :( 
Maybe because  I havent been studying korean since 2012 :(

Answer

"How many hours did you sleep yesterday ? 어제 몇시간에 잤어요?
what time did you sleep yesterday ? 어제 몇 시(부터) 잤어요?

Answer

If there is "간" at the end of a time construction (몇시간) as you see in this case, it means "period of time". So the full sentence can be translated as:
1. How many hours you (I, he, etc.) slept yesterday morning?
2. Yesterday morning you (I, etc.) slept a few hours.

Answer

I slept a few hours in yesterday morning.

Answer

I think in this case the word order is incorrect, and it's a reason why you get confused.

어제 아침에 몇시간 잤어

لا تفوّت فرصة تعلّم لغة جديدة وأنت مرتاح في منزلك. تصفّح مجموعتنا المختارة من مدرّسي اللغات ذوي الخبرة وسجّل في درسك الأول الآن!