¿Cuántos años duró el servicio de reparto de correo Pony Express?
How many years did the Pony Express mail delivery service last?
The Pony Express was in operation for just around one-and-a-half years, from April 1860 to October 1861.
El Pony Express funcionó durante apenas un año y medio, de abril de 1860 a octubre de 1861.
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