The time at which Sancho and Bolsa were able to see Abraham at the zoo where they were sent by Robin is: 4 o'clock.
In this excerpt from the story about Sancho and Bolsa and their search for William Morningstar, Robin, a cafe employee, informs them that Abraham, William's parrot, is at the zoo, so they head there and talk to the information lady.
The lady tells them where they can find parrots in general, however, Abraham is in an office, which they can only enter until four o'clock.
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