Quick answer
"Desde cuándo" is a phrase which is often translated as "since when", and "hace cuánto tiempo" is a phrase which is often translated as "how long". Learn more about the difference between "desde cuándo" and "hace cuánto tiempo" below.
desde cuándo
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
a. since when
¿Desde cuándo bailas tango?Since when do you dance tango?
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hace cuánto tiempo
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (in statements)
a. how long
Si supieras hace cuánto tiempo te estoy esperando, también estarías enojada.If you knew how long I've been waiting for you, you'd also be angry.
2. (in questions)
a. how long
¿Hace cuánto tiempo tocas el piano?How long have you been playing piano?
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