Your sentence
a+las+veinte+horas
Words in this sentence
a
to; by; at; Used before words referring to people, pets, or personified objects or places that function as direct objects: personal a.
Preposition
hora
hour (a time period of sixty minutes); time (the moment, as indicated by a clock or similar device); high time (usually with "ya"); hour, period (of class); appointment (e.g. with the doctor)
Noun