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"Sofía" is a proper noun which is often translated as "Sophia", and "cuánto tiempo" is a phrase which is often translated as "how long". Learn more about the difference between "Sofía" and "cuánto tiempo" below.
Sofía()
A proper noun refers to the name of a person, place, or thing.
cuánto tiempo()
A phrase is a group of words commonly used together (e.g., once upon a time).
b. how much time
¿Adónde te vas de vacaciones y por cuánto tiempo?Where are you going on vacation and for how much time?