vs 

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"How many years" is a phrase which is often translated as "cuántos años", and "how long" is a phrase which is often translated as "cuánto". Learn more about the difference between "how many years" and "how long" below.
how many years(
hau
 
meh
-
ni
 
yirz
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. cuántos años
I can't remember how many years have passed since I left my home town.No recuerdo cuántos años pasaron desde que dejé mi ciudad natal.
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how long(
hau
 
lang
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. cuánto
Do you know how long we have to wait for the movie to begin?¿Sabes cuánto tenemos que esperar para que comience la película?
b. cuánto tiempo
How long is the movie?¿Cuánto tiempo dura la película?
I don't care how long you have to wait!¡No me importa cuánto tiempo tengas que esperar!
a. cuánto mide
How long is your surfboard?¿Cuánto mide tu tabla de surf?
You need to check how long the table is before you buy a tablecloth.Tienes que comprobar cuánto mide la mesa antes de comprar un mantel.
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