Final answer:
The duration of Jonah's walk through the city of Nineveh is not specified in the Bible.
Step-by-step explanation:
The question asks how long it took for Jonah to walk through the city of Nineveh. The Bible does not provide a specific timeframe for Jonah's journey through the city. However, based on the information available, we know that Nineveh was a large city with monumental gateways and expansive architecture. Therefore, it is likely that Jonah's walk through the city would have taken a significant amount of time. Unfortunately, exact details of the duration of his journey are not provided in the biblical account.