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hubiera tardado
Past perfect subjunctive yo conjugation of tardar.
hubiera tardado
Past perfect subjunctive él/ella/usted conjugation of tardar.

tardar

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Si Corbis hubiese digitalizado todo, se hubiera tardado 25 años en terminar.
If Corbis had scanned everything it would have taken 25 years to finish.
Este tipo de cambio está acelerando grandemente un método que, en el pasado, se hubiera tardado siglos en completar.
This type of change is greatly accelerating a method that, in the past, would have taken centuries to complete.
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