Final answer:
An employer must report a workplace injury resulting in hospitalization within 24 hours of learning about it.
Step-by-step explanation:
According to the provided information by OSHA, when an employee becomes hospitalized due to a workplace injury, the employer must report the event within 24 hours of learning about it. This means that once the employer is aware of the hospitalization, they need to notify OSHA within 24 hours. It is an important requirement to ensure that workplace safety incidents are properly addressed and can help prevent further occurrences.