Answer
500 hours of running.
Work Step by Step
The distance between NY and CA is about 5000 km.
At 10 km/hour, it would take about 500 hours of running. (At about 5 hours of running per day, this would take several months of a person's time.)
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.