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"Cuánto tiempo" is a phrase which is often translated as "how long", and "Sofía" is a proper noun which is often translated as "Sophia". Learn more about the difference between "cuánto tiempo" and "Sofía" below.
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?
Sofía()
A proper noun refers to the name of a person, place, or thing.