How to parse the question "How many hours did you take at the institution?"
In the US, university education is quantified as "credits" typically expressed as "credit hours" referring to 1 hour per week of instruction for a semester (so about 15-16 hours of face time). A course meeting 3X weekly would be worth 3 credit hours and is usually expected to involve an additional 6 hours weekly of work outside class. A 4 year bachelor's degree is about 120 credit hours.

I'd interpret this the same as asking for how many credits you took with that institution, expressed in an appropriate conversion to credit hours.