vs 

QUICK ANSWER
"Hace cuánto tiempo" is a form of "hace cuánto tiempo", a phrase which is often translated as "how long". "Desde cuándo" is a phrase which is often translated as "since when". Learn more about the difference between "hace cuánto tiempo" and "desde cuándo" below.
hace cuánto tiempo(
ah
-
seh
 
kwahn
-
toh
 
tyehm
-
poh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
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.
a. how long
¿Hace cuánto tiempo tocas el piano?How long have you been playing piano?
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desde cuándo(
dehs
-
deh
 
kwahn
-
doh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. since when
¿Desde cuándo bailas tango?Since when do you dance tango?
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