Breakdown of Hace una hora que salió de casa.
la casa
the house / home (also "at home")
un
a, an, some
de
from
que
that (relative pronoun, conjunction)
salir
to go out, to leave / to appear, to come out (on the body)
la hora
the hour; the time (on the clock: what time is it?)
hacer
ago, for (time elapsed)
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